The ocean is not what you think.
Twenty-five years of reef keeping, dive trips and travels across 80+ countries — written by one marine biologist who has actually been in the water.
The stories drawing the most readers to TheSea.Org right now — updated from real visits.
Red-Lipped Batfish — Galapagos Fish That Walks on Fins and Wears Red Lipstick
The red-lipped batfish is a 20 cm Galapagos anglerfish that walks on its fins and uses a chemical lure. Why the red lips, what it eats, where to see it.
Bizarre Sea Creatures
Lifespan of a Giant Squid — Why a 13-Metre Animal Lives Only Five Years
TheSea.Org▸Marine Life▸Squid▸Lifespan of a Giant Squid Lifespan of a Giant Squid — Why a 13-Metre Animal Lives Only Five Years Squid Q&A By Blane Perun 9…
Squid Q&A
Are Dolphins Evil? The Dark Side of Dolphins, Explained
Are dolphins evil? No, but they kill porpoises, commit infanticide and coerce mates. The evidence from Scotland, Shark Bay and Florida, with sources.
Dolphins Q&A
Octopus Adaptations — How an Invertebrate Out-Engineered the Reef
TheSea.Org▸Marine Life▸Octopus▸Octopus Adaptations Octopus Adaptations — How an Invertebrate Out-Engineered the Reef Octopus Q&A By Blane Perun 9 min read What are the main adaptations of…
Octopus Q&A
Almost every article you will find online about the ocean was written by someone who has never been in it. This site is what happens when a marine biologist with twenty-five years in the water writes without a content calendar telling him what’s trending — the actual anatomy, the actual intelligence, the actual reputation.
The newest reports on TheSea.Org — this block updates the moment a new story goes live.
Jupiter Inlet Lighthouse — Meade’s 1860 Tower, Station J and the Climb
Jupiter Inlet Lighthouse: George Meade's 1860 tower, the Civil War sabotage, the 1928 hurricane, WWII Station J, and climbing it today, with hours and prices.
Key West Lighthouse — Barbara Mabrity, 88 Steps and Visiting the Museum
Key West Lighthouse and Keeper's Quarters: the 1846 hurricane, keeper Barbara Mabrity, the 1848 tower raised in 1894, 88 steps to climb, hours and prices.
Ponce de Leon Inlet Lighthouse — Florida’s Tallest, Its History and Climb
Ponce de Leon Inlet Lighthouse, Florida's tallest at about 175 feet: the lost 1835 tower, Stephen Crane's shipwreck, 203 steps, hours and admission.
Pages search engines are starting to reward — the ones on the edge of page one.
Conger Eel (Congridae) — Size, Habitat, Diet & Life Cycle
Conger eels grow to 3 m and 110 kg, hide in wrecks and reef caves by day and spawn only once before dying. Size, range, diet, record catches and how to ID one.
Megalodon vs Blue Whale — Is Megalodon Bigger? Size Comparison
Is megalodon bigger than a blue whale? No. Blue whales reach 33.6 m and 190 t; megalodon 15-18 m typical, 24 m max. Scale chart, weight, bite, teeth compared.
What Do Barnacles Do for Whales? Hitchhikers, Not Helpers
Whale barnacles get a free ride and food; the whale gets little in return beyond possible armour for fights. Which whales carry them, how much and do they hurt.
A rotating pick from across 2,700 reports — refresh the page for a new set.
Darth Maul Zoanthids — The Orange-and-Black Zoa Morph Explained
Darth Maul zoanthids are an orange, red and black zoa morph named for the Star Wars villain. How to identify, keep, protect and frag them safely.
Sea Turtles in Florida — 5 Species, Where They Nest and Where to See Them
Sea turtles in Florida: loggerheads, greens and leatherbacks nest on its beaches by the tens of thousands. Here are the species, the best places and numbers.
How Long Can a Sea Otter Stay Underwater? Dive Times & Depths
Most sea otter dives last about a minute and rarely over four; the limit is about five. How deep they go (up to ~100 m), why dives are short, how pups learn.
Cost of a Scuba Diving Course — What the Open Water Price Really Covers
A scuba course costs about $500-$1,050 in the US and Caribbean (shop prices checked Nov 2026). What is included, what is extra, group vs private rates and how to save.
Does Pee Help a Jellyfish Sting? (No — What Actually Works)
Does pee help a jellyfish sting? No. Lab tests show urine can make stinging cells fire and worsen a sting. Here is where the myth came from and what works.
Red Sea Urchin (Mesocentrotus franciscanus) — The Giant Urchin That Lives 100+ Years
The red sea urchin, Mesocentrotus franciscanus, is the largest urchin, with a test over 18 cm, and can live over 100 years. Range, diet, fishery and facts.
Vodka Dosing a Reef Tank — How Carbon Dosing Lowers Nitrate and Phosphate
Vodka dosing feeds bacteria that strip nitrate and phosphate from a reef tank. How it works, a cautious starting dose and ramp, what to test and the risks.
Damawan Flatworm (Pseudobiceros damawan) — ID, Range and Habits
The Damawan flatworm (Pseudobiceros damawan) is a grey, orange-rimmed reef flatworm named for a reef in Papua New Guinea. ID, size, range, diet and behaviour.
Mushroom Coral Care — Light, Flow, Feeding and Placement
Mushroom coral care made simple: low to moderate light, gentle flow, stable but not ultra-clean water, and placement that stops corallimorphs taking over.
What Do Coral Reefs Do?
Coral reefs shelter about a quarter of marine species, break waves to protect coasts, feed millions, make sand and islands, and recycle nutrients. Here's how.
Scuba Spearfishing — Where It Is Legal, the Rules, Gear and Ethics
Spearfishing on scuba is allowed in Florida with limits but banned in the Bahamas, West Hawaii, Mexico and Puerto Rico. Florida rules, lionfish, gear and ethics.
How Do Oceanographers Measure the Salinity of Ocean Water?
Oceanographers measure salinity by conductivity with CTDs, close to 4,000 Argo floats and satellites. How it works, its history, and why ocean salt matters.
Is a Shark a Fish? Yes — a Cartilaginous Fish, Not a Mammal
Yes, a shark is a fish: a cartilaginous fish with gills, fins and a cartilage skeleton. How sharks differ from bony fish, and why they are not mammals.
Fulmars — The Stiff-Winged Gull Lookalikes That Spit Oil
Fulmars look like gulls but are tubenoses related to albatrosses. Northern fulmars can live 45+ years, spit stomach oil at predators and number 15-30 million.
Magnesium in a Reef Tank — The 1,250-1,350 ppm Range and Why It Matters
Magnesium in a reef tank: seawater levels, why the Mg/Ca ratio matters to corals, what uses it up, test accuracy, safe dosing math and the bryopsis question.
Mid-Ocean Ridge — Earth’s Longest Mountain Range
The mid-ocean ridge is a 65,000 km undersea mountain chain where new seafloor forms as plates pull apart. How it works, spreading rates and hydrothermal vents.
Sea Urchins Wearing Hats — Why Urchins Cover Themselves
Why do sea urchins wear hats? The science of covering: UV shade in tropical urchins, wave protection in green urchins, litter, and the 3D-printed hat craze.
Pompeii — The Roman Town Buried by Vesuvius in 79 CE, Preserved Under 6 m of Volcanic Ash for ~1,700 Years
TheSea.Org▸Travels▸Europe▸Mediterranean coast▸Pompeii Pompeii — The Roman Town Buried by Vesuvius in 79 CE Italy ▸ Campania ▸ Bay of Naples By Blane Perun Visited multiple 10…
More of what readers keep coming back for.
Bobbit Worm — Ambush Predator Buried in Reef Sediment That Can Bisect Fish
TheSea.Org▸ Bizarre Sea Creatures▸ Bobbit Worm Bobbit Worm — Eunice aphroditois Bizarre Sea Creatures By Blane Perun April 15, 2026 9 min read What is a…
Giant Squid — Architeuthis dux, the Deep-Sea Legend Photographed in 2004
TheSea.Org▸Squid▸Giant Squid Giant Squid — Architeuthis dux, the Deep-Sea Legend Photographed in 2004 SquidBy Blane Perun11 min read What is a giant squid? The giant squid…
Recently added reports from across the site.
Sanibel Lighthouse — History, Hurricane Ian and Lighthouse Beach
The Sanibel Lighthouse at Point Ybel: lit in 1884, a "Sanibel class" iron tower, damaged by Hurricane Ian in 2022, relit in 2023 and given a new leg in 2024.
St. Augustine Lighthouse — History, 219 Steps and Visiting Tips
St. Augustine Lighthouse: Spanish watchtowers, Florida's first US light in 1824, the 165-foot 1874 tower and its original lens, 219 steps and current hours.
Cape Florida Lighthouse — Key Biscayne’s 1825 Tower and Its History
Cape Florida Lighthouse on Key Biscayne: built 1825, burned in the 1836 Seminole siege, raised to 95 feet in 1855, relit in 1996. History, fees and tours.
More pages gaining ground in search.
Do Seals Eat Penguins? Which Seals Do, and How They Hunt
Which seals eat penguins? Leopard seals take 1–5% of Adélie colonies a season; fur seals, NZ and South American sea lions kill penguins locally. Studies, numbers, how they hunt.
Seals Q&A
Are Sharks Mammals? No, and Not Marine Mammals Either
No. Sharks are cartilaginous fish, not mammals or marine mammals: they breathe with gills and never nurse their young. How to tell a shark from a dolphin.
Sharks Q&A
Are Dolphins Evil? The Dark Side of Dolphins, Explained
Are dolphins evil? No, but they kill porpoises, commit infanticide and coerce mates. The evidence from Scotland, Shark Bay and Florida, with sources.
Dolphins Q&A
Ocean Decomposers — The Unsung Recyclers of the Sea
Ocean decomposers are bacteria, fungi and detritivores that break down dead matter and recycle nutrients. Examples from marine snow microbes to bone worms.
Oceans Q&A
Can Alligators Breed With Crocodiles? Why There Are No Hybrids
No. Alligators and crocodiles can't breed: separate families split 80+ million years ago, with different chromosomes. Which crocodiles do hybridise, and why.
Croc Q&A
Freshly built sections — each a full guide with its own hub.
Shark Species A–Z — Types of Sharks, All 9 Orders Explained
Types of sharks explained by a diver: all 9 shark orders, 540+ species, and an A–Z index of shark species profiles from angel shark to zebra shark.
Sharks
Sport & Game Fish of Florida and the Gulf — The Complete Field Guide
Florida and Gulf game fish explained: tarpon, snook, redfish, goliath grouper, marlin, mahi, tuna and more, with sizes, world records, ranges and seasons.
Sport & Game Fish
Prehistoric Sea Creatures — 500 Million Years of Ocean Giants
Prehistoric sea creatures from the Cambrian to megalodon: who ruled when, the largest giants, how fossils form and are dated, plus 26 profiles and survivors.
Prehistoric Sea Creatures
Seashells — How They Form, What Lives Inside, and Where to Find Them
Seashells are mineral skeletons built by living mollusks. Learn how shells form, why they spiral, what lived inside, and where Florida's best shelling is.
Seashells & Shelling
Rays, Skates & Sawfish — A Field Guide to the Flat Sharks
Field guide to rays, skates and sawfish: stingrays, eagle rays, skates, guitarfish, electric rays and sawfish, with sizes, stings, IUCN status and Florida tips.
Rays
Bioluminescence — How and Why the Ocean Glows
Bioluminescence is living light from a luciferin-luciferase reaction. How it works, why ocean light is blue, how scientists study it and where to see it.
Bioluminescence & Plankton
Field observations — written down at the surface, between dives, before they could be polished into something less true.
Another rotating set from the archive.
Armored Snail — Iron-Sulphide Armour Grown From Hydrothermal Vent Minerals
Scaly-foot snail facts: the deep-sea vent snail with iron sulphide armour, a giant heart and bacterial partners, now Endangered by seabed mining.
What Is Soft Coral?
What is soft coral? Octocorals with eight feathery tentacles and flexible bodies stiffened by sclerites instead of stone. Types, feeding, defences and threats.
Cobia — The Shark-Shaped Fish That Shadows Rays
Cobia look like sharks, shadow rays and turtles, and migrate up Florida's Gulf coast each spring. Size, the 135-lb record, ID, diet, range and farming.
What Do Anemones Eat? Wild Diets and What to Feed Aquarium Anemones
What do sea anemones eat? Plankton, shrimp, crabs, mollusks and small fish, plus sugars from algae. Wild diets by species and a safe aquarium feeding plan.
Comb Jellyfish (Ctenophores) — Facts, Rainbow Light & Invasions
Comb jellies (ctenophores) explained: how the rainbow combs work, sticky colloblasts, brainless nerve nets, body shapes, fossils and the Mnemiopsis invasions.
Can You Eat Jellyfish? Cannonball Jellies and Asian Cuisine
Can you eat jellyfish? Yes. About a dozen species are cured with salt and alum and eaten in Asia, crunchy and low in calories. How it's made and what's safe.
Blue Hornet Zoanthids — The Hornet Family of Zoas Explained
Blue Hornet zoanthids belong to the hornet family of zoas, marked by a bright disc halo and alternating skirt. History, ID, care and fragging.
What Phylum Are Flatworms In? Platyhelminthes and Its Classes
Flatworms are in the phylum Platyhelminthes. How the old four classes gave way to a DNA family tree, where parasites came from, and why acoels were removed.
Blue Ringed Octopus Golf-Ball Sized, Deadlier Than a Cobra, No Antivenom
TheSea.Org▸Octopus▸Blue Ringed Octopus Blue Ringed Octopus — Golf-Ball Sized, Deadlier Than a Cobra, No Antivenom OctopusBy Blane Perun10 min read What is a blue ringed octopus?…
Octopus Adaptations — How an Invertebrate Out-Engineered the Reef
TheSea.Org▸Marine Life▸Octopus▸Octopus Adaptations Octopus Adaptations — How an Invertebrate Out-Engineered the Reef Octopus Q&A By Blane Perun 9 min read What are the main adaptations of…
Odesa, Ukraine — Black Sea Port, Potemkin Stairs and a City Under Fire
Odesa, founded in 1794, is Ukraine's great Black Sea port. Potemkin Stairs, Opera House, 2,500 km of catacombs, Black Sea dolphins, and the impact of war.
Reef Tank Salinity — 35 ppt, 1.026 SG and How to Measure It Right
Reef tank salinity: why most reefers keep 35 ppt (about 1.026 SG), how to calibrate a refractometer, fixing high or low salinity and auto top-off tips.
Are Whale Sharks Friendly to Humans? Safe, Docile Giants
Whale sharks are harmless, docile filter-feeders that pose no threat to people. Why they tolerate swimmers, the real risks and the rules to follow.
Sheepshead Fish — The Fish With Human-Like Teeth
Sheepshead fish have human-looking incisors and molars for crushing barnacles and oysters. Why, how big they get, the 21-lb record and Florida rules.
What Happened to Sea Otters in the 1800s? The Great Fur Hunt
In the 1800s sea otters were hunted almost to extinction for fur. From 1741 to 1911 numbers fell from up to 300,000 to under 2,000. How it happened and ended.
The Aqua-Lung — How Cousteau and Gagnan Invented Modern Scuba
The Cousteau-Gagnan Aqua-Lung: how a 1942 demand regulator became open-circuit scuba in 1943, how it works, what came before, and how it spread.
History of Aquaculture — From Ancient Eel Traps to Offshore Salmon Farms
History of aquaculture: Budj Bim eel traps 6,600 years old, Fan Li's carp manual, Roman oysters, Hawaiian fishponds and the modern farming boom.
Why Is Coral Bleaching A Problem?
Why is coral bleaching a problem? Bleached corals starve and die, reefs collapse, a quarter of marine species lose habitat, and coasts lose food and protection.
A fresh random pick on every visit.
Small Crustaceans — The Tiniest Crabs, Copepods and Microscopic Species
The smallest crustaceans are under 0.1 mm long. Meet tantulocarids, copepods, ostracods, water fleas and sand-dwelling mystacocarids, and why they matter.
The Octopus Mouth — Where Eight Arms Meet the Beak, Radula, and Venom Glands
TheSea.Org▸Marine Life▸Octopus▸Octopus Mouth The Octopus Mouth — Where Eight Arms Meet a Parrot's Beak Octopus Q&A By Blane Perun 8 min read Where is the octopus…
Bioluminescent Squid — Making Their Own Light in the Darkness
TheSea.Org▸Marine Life▸Squid▸Bioluminescent Squid Bioluminescent Squid — Making Their Own Light in the Darkness Squid Q&A By Blane Perun 9 min read What are bioluminescent squid? Bioluminescent…
Sea Turtle Rescue — What to Do If You Find a Stranded Turtle
Found a stranded, hooked or cold-stunned sea turtle? What to do, who to call, and how rescue centers treat cold stunning, hooks, tumors and boat strikes.
Eagle Rays (Myliobatidae) — Spotted Eagle Ray Facts and Species
Eagle rays (Myliobatidae) are fast, flying rays with duck-bill snouts. Spotted eagle ray size (3 m wingspan), diet, breeding, venom and Endangered status.
Stove-Pipe Sponge (Aplysina archeri) — The Reef’s Tallest Tubes
The stove-pipe sponge grows lavender tubes up to 1.5 m tall on Caribbean reefs and may take centuries to reach full size. Size, color, range and threats.
How to Get Rid of Diatoms — Step-by-Step Treatment Plan
TheSea.Org▸Reef Pests▸How To Get Rid Of Diatoms How to Get Rid of Diatoms — Step-by-Step Treatment Plan Reef Pests By Blane Perun 9 min read How…
Picasso Triggerfish — The Abstract-Art Fish of Indo-Pacific Lagoons
Picasso triggerfish (Rhinecanthus aculeatus): size, range, diet, trigger spine, maternal egg care, colour vision research and what to know before keeping one.
Scuba Diving Flag — Diver Down vs Alpha Flag Meaning and Rules
The red diver-down flag with a white stripe marks divers below in the US and Canada; the blue-white Alpha flag tells vessels to keep clear. The rules.
Reef Aquarium Water Quality — Nutrients, Chemistry and Stability
Reef aquarium water quality: ammonia, nitrate, phosphate, alkalinity, calcium, magnesium, pH and oxygen, how to test them, and how to export nutrients.
Where Do Nautilus Live? Range, Depth and Habitat
Nautiluses live on steep reef slopes in the tropical Indo-Pacific, usually 100 to 500 m deep. Range by species, depth limits and where they come shallow.
Stepan Razin
Stepan (Stenka) Razin: the Don Cossack who raided Volga barges and the Caspian, destroyed a Persian fleet in 1669, led the 1670 revolt and became a folk hero.
Mimic Octopus Facts — The Essential Biology of the Indo-Pacific Octopus That Impersonates 15+ Species
TheSea.Org▸Marine Life▸Octopus▸Mimic Octopus▸Mimic Octopus Facts Mimic Octopus Facts — The Essential Biology of the Indo-Pacific Octopus That Impersonates 15+ Species Mimic Octopus Q&ABy Blane Perun8 min…
Ecuador Coral Reef Maps
Ecuador coral reef map: coral in the Galapagos, best at Darwin and Wolf, plus Machalilla and Isla de la Plata, and how El Nino wiped out most Galapagos coral.
How Long Can a Pilot Whale Hold Its Breath? About 15–20 Minutes
Pilot whales usually hold their breath under 15 minutes, with tagged deep dives of about 18 to 21 minutes and depths near 1,000 m. How they do it, compared.
Parrotfishes — The Beaked Reef Grazers That Make Sand
Parrotfish scrape algae with beaks of fused teeth, grind coral into sand, sleep in mucus cocoons and change sex. Species, size, colours and why reefs need them.
Diving Raiatea — The Nordby Wreck, Te Ava Piti Pass and the Taha’a Lagoon
Diving Raiatea: the Nordby, a three-masted ship sunk in 1900 at about 30 m, Te Ava Piti pass drifts with reef sharks, and a lagoon shared with Taha'a.
Indianapolis Motor Speedway — A 2.5-Mile Brick Oval on Pennsylvanian Coal-Swamp Bedrock
TheSea.Org▸Travels▸North America▸Indianapolis Motor Speedway Indianapolis Motor Speedway — A 2.5-Mile Brick Oval on Pennsylvanian Coal-Swamp Bedrock Indiana ▸ Speedway, IN ▸ Marion County By Blane Perun…
More fresh additions to the site.
Florida Lighthouses — History, Heights and Which Ones You Can Climb
Florida's historic lighthouses: St. Augustine, Ponce Inlet, Cape Florida, Jupiter Inlet, Key West and Sanibel, with dates, heights, steps and visiting notes.
Squid Fishing — Jigs, Lights and the World’s Squid Fleets
How squid fishing works: night lights, jigs, purse seines and trawls, the global catch of over 3 million tonnes, US squid fisheries, and the rules for anglers.
Strawberry Squid — The Cock-Eyed Squid With One Big Yellow Eye
The strawberry squid is a red, light-spotted deep-sea squid with one big upward eye and one small downward eye. How its odd eyes work and where it lives.
Long-form guides, complete and cited
Each piece is a full field guide — taxonomy, behavior, habitat, and conservation status — not a listicle. Six of the most-read are below, plus octopus adaptations, giant squid lifespan, and adaptations of a dumbo octopus for further reading.
Bobbit Worm — Ambush Predator Buried in Reef Sediment That Can Bisect Fish
TheSea.Org▸ Bizarre Sea Creatures▸ Bobbit Worm Bobbit Worm — Eunice aphroditois Bizarre Sea Creatures By Blane Perun April 15, 2026 9 min read What is a…
Bizarre Sea Creatures
Giant Squid — Architeuthis dux, the Deep-Sea Legend Photographed in 2004
TheSea.Org▸Squid▸Giant Squid Giant Squid — Architeuthis dux, the Deep-Sea Legend Photographed in 2004 SquidBy Blane Perun11 min read What is a giant squid? The giant squid…
Squid
Gulper Eel — The Deep-Sea Fish With a Mouth Bigger Than Its Body
The gulper eel (Eurypharynx pelecanoides) hunts at 500-3,000 m with a mouth a quarter of its length. How it feeds, its glowing tail, size and life cycle.
Bizarre Sea Creatures
Parts of a Squid — A Head-to-Tail Field Guide to Cephalopod Anatomy
TheSea.Org▸Marine Life▸Squid▸Parts of a Squid Parts of a Squid — A Head-to-Tail Field Guide Squid Q&A By Blane Perun 8 min read What are the main…
Squid Q&A
Sea Pig — Abyssal Sea Cucumber That Herds in Thousands on the Ocean Floor
Sea pigs (Scotoplanes) are deep-sea sea cucumbers that walk on hydraulic legs at 1,200-5,000 m. How they feed, find whale falls, and shelter baby crabs.
Bizarre Sea Creatures
Deep Sea Anglerfish — Bioluminescent Lure & Parasitic Males Fused for Life
Deep sea anglerfish: about 160 species with glowing bacterial lures, 6 mm males that fuse to females, what they eat, how deep they live and how they were filmed.
Bizarre Sea Creatures
Close to page one — give them a read.
Parts of a Pirate Ship — Labeled Diagram and Glossary
Parts of a pirate ship explained with a labeled diagram: bow, stern, bowsprit, quarterdeck, masts, sails, rigging, gun ports, hold, plus a 33-term glossary.
Pirate Ship Names — Real Pirate Ships, Their Captains and Fates
Real pirate ship names with captains, years and fates: Queen Anne's Revenge, Whydah Gally, Royal Fortune, Adventure Galley, Fancy and more, plus naming habits.
Rounding out the most-visited stories.
Was Blackbeard Real
TheSea.Org▸Pirates▸Blackbeard Was Blackbeard Real — The Man Behind the Myth Pirates By Blane Perun 7 min read The short answer Yes. Edward Teach — Blackbeard —…
Pirates Blackbeard
Dumbo Octopus — The Deepest-Living Octopus, Found at Nearly 7,000 Metres
TheSea.Org▸ Bizarre Sea Creatures▸ Dumbo Octopus Dumbo Octopus — Grimpoteuthis Bizarre Sea Creatures By Blane Perun April 19, 2026 9 min read What is a Dumbo…
Bizarre Sea Creatures
Giant Pacific Octopus Size — How Big the World’s Largest Octopus Species Actually Gets
TheSea.Org▸Marine Life▸Octopus▸Giant Pacific Octopus▸Giant Pacific Octopus Size Giant Pacific Octopus Size — How Big the World's Largest Octopus Species Actually Gets Giant Pacific Octopus Q&ABy Blane…
Octopus Pacific Q&A
Squid Eggs — Gelatinous Masses of a Thousand Tiny Embryos
TheSea.Org▸Marine Life▸Squid▸Squid Eggs Squid Eggs — Gelatinous Masses of a Thousand Tiny Embryos Squid Q&A By Blane Perun 9 min read What are squid eggs? Squid…
Squid Q&A
Megalodon vs Blue Whale — Is Megalodon Bigger? Size Comparison
Is megalodon bigger than a blue whale? No. Blue whales reach 33.6 m and 190 t; megalodon 15-18 m typical, 24 m max. Scale chart, weight, bite, teeth compared.
Whales Q&A
Three sources dominate ocean content online. Here is how this one is built differently.
Eighty countries of fieldwork — not all of it underwater. The places that frame the dives, in their own right.
The Valley of the Kings
Tombs cut for the New Kingdom pharaohs. Tutankhamun, Ramesses II, Seti I — the entire roster of Egypt’s golden age, sealed into one limestone valley.
Petra — the Rose City
Carved into Jordan’s red sandstone by the Nabataeans. Two thousand years later, it still feels like a place that should not exist.
Jaffa — the oldest port
One of the oldest continuously occupied ports on Earth. The harbour where the cedars of Lebanon entered Solomon’s temple.
The Dead Sea — ten times saltier
The lowest land surface on the planet. A place where the laws of swimming temporarily suspend themselves.
The reefs I have come back to most often. From the Andaman to the Caribbean, with notes on how reef bleaching reaches the surface and what actually slows it.
The Andaman Sea — the Bay of Bengal’s hidden reef province
Off the western coast of Thailand and the Andaman archipelago, a stretch of reef as biologically rich as anything in the Coral Triangle — with monsoon-driven visibility windows that make it accessible to divers only six months out of the year.
Field notes from Phuket, the Similan Islands, Richelieu Rock, and the Burma Banks — including the long-distance return migrations of whale sharks, the mass spawning aggregations of Pacific cephalopods on the rim, and the role of sea turtle habitat in shaping the seagrass meadows beyond the reef edge.
Read the full report →The most recent reports, updated automatically.
What Do Squid Eat? Fish, Crustaceans, Other Squid and Plankton
Squid eat fish, shrimp, crabs and other squid, and hatchlings start on copepods. How squid hunt, how much they eat, and what each well-known species feeds on.
The Kraken — The Legend, Its Origins and the Real Giant Squid
Where the kraken legend came from: Norwegian fishermen, Egede and Pontoppidan, a ship-sinking octopus engraving, and the giant squid that made the monster real.
How Long Do Seahorses Live? Lifespan in the Wild and in Aquariums
Most seahorses live about 1 to 5 years: around a year for the smallest species, 3 to 5 for larger ones. What tagging studies show, and how seadragons compare.
Blane Perun
Marine biologist, underwater photographer, and founder of TheSea.Org — online since 1999. Reef keeper and coral grower since 1996, traveler across more than 80 countries, and a diver from the Caribbean to the Red Sea and the South Pacific, with a particular focus on coral reef systems.
