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Hydrothermal vents form where tectonic plates pull apart at mid ocean ridges. Seawater seeps into the crust, is superheated by magma to as much as 464 degrees Celsius, and is kept from boiling by the weight of the ocean above, becoming a supercritical fluid that strips sulfur, iron, copper, and zinc from the rock. When it hits water near two degrees Celsius, the metals precipitate instantly. Black smokers build sulfide chimneys up to 60 meters tall at up to 30 centimeters a day, while cooler white smokers release barium, calcium, and silicon. Their plumes spread for thousands of kilometers, carrying iron and manganese through the ocean, and researchers find vents by sniffing for helium-3 and radon-222. Since the first vents were found in 1977, biologists have mapped food webs built on chemosynthesis, in which bacteria draw energy from toxic hydrogen sulfide.

Alkaline vents are a leading candidate for where life began. Pockets of supercritical carbon dioxide could shelter early molecules from water that breaks them apart, and the proton gradient between alkaline vent fluid and the acidic ancient ocean works like a battery across porous iron sulfur rock. Tube like microfossils from the Nuvvuagittuq Belt in Quebec may date to 4.28 billion years ago, and vent plumes have been detected on Europa and Enceladus. The same chimneys hold seafloor massive sulfide deposits rich in copper, gold, zinc, and rare earth metals, and Japan completed the first large scale mining test on one in 2017.

• Giant tube worms, Riftia pachyptila, grow over six feet tall with no mouth or gut, farming bacteria in an organ called the trophosome.
• Zinc in the worms' blood binds sulfide so it cannot poison the hemoglobin carrying oxygen.
• The scaly foot snail builds armor from iron sulfide to fend off venomous cone snails.
• A chimney nicknamed Godzilla off Oregon reached the height of a 15 story building before collapsing in 1996.
• Vent animals still depend on oxygen made by surface photosynthesis, so they are not fully independent of the sun.

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The RMS Olympic was White Star Line's answer to Cunard's fast Lusitania and Mauretania. Unable to afford the coal to beat them on speed, J. Bruce Ismay's company, backed by J.P. Morgan, bet on size and luxury and gave Harland and Wolff in Belfast a cost plus five percent contract. Known in the yard as hull 400, she was launched in 1910 with her hull painted pale gray for the press photos, and offered a Louis XVI restaurant, a Turkish bath, a squash court, a pool, and private cabins even in third class. On her fifth voyage in September 1911, under Captain Edward Smith, suction from her turn in the Solent dragged the cruiser HMS Hawke into her side. Repairing her used parts from the unfinished Titanic and pushed her sister's maiden voyage into April 1912.

On April 14, 1912, the Olympic was about 505 miles away when she heard Titanic's distress call. Captain Herbert Haddock raced toward the site, but the Carpathia's captain told her to stay away so survivors would not have to board a mirror image of the ship that sank. Rotten collapsible lifeboats then sparked a strike by 284 firemen, and 54 sailors arrested for mutiny were discharged without penalty. A 1912 to 1913 refit added an inner skin and raised her bulkheads to B deck. In May 1918, in dazzle camouflage and packed with American troops, Captain Bertram Hayes rammed and sank U-103, the only known case of a passenger liner sinking an enemy warship in the First World War.

• She rescued the crew of the mined battleship HMS Audacious in 1914 and was held at Lough Swilly to keep the loss secret.
• Troops nicknamed her Old Reliable after she carried more than 200,000 of them and survived a torpedo that failed to explode.
• Converting from coal to oil in 1919 cut her engine room crew from 350 men to 60.
• A 16 year old Archibald Leach, later Cary Grant, made his first trip to America aboard her.
• In May 1934 she sliced the Nantucket lightship in half in fog, and parts of her interiors survive in the White Swan Hotel in Alnwick.

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The Klabautermann is a water sprite of German, Dutch, and Frisian sailor lore: a figure about two feet tall with a red beard, green teeth, a red or gray jacket, a round hat or nightcap, and a caulking hammer or tobacco pipe. He is bound to the ship's timber. One tradition held that the soul of a stillborn or unbaptized child buried beneath a tree passed into the wood, and on the island of Rugen, children with broken bones were passed three times through a split oak whose healing was tied to theirs, leaving part of the child's soul in the tree. While the crew slept, he pumped the hold, plugged leaks, mended tackle, and warded off fire, illness, and pirates. Seeing him meant the ship was doomed, unless a sailor went alone to the capstan at midnight and looked backward between his legs through the capstan hole.

Friedrich Kluge traced the name to kalfatern, to caulk, while the Brothers Grimm linked it to a Low German word for knocking, the sound of a working wooden hull. The heroic helper became a demon as retired sailors spun scarier tales ashore, yet historians David Kirby and Merja-Liisa Hinkkanen found no British origin and trace him to St. Phocas, patron saint of Black Sea sailors, merging with Baltic house spirits called kobolds. In Hans Fallada's novel Every Man Dies Alone, a Gestapo inspector gives the anonymous writer of anti Nazi postcards the code name Klabautermann.

• Heinrich Heine recorded a captain who kept a shrine to the Klabautermann in his cabin with offerings of the best food and drink.
• A slighted Klabautermann tangles ropes, throws firewood, breaks the carpenter's tools, and slaps lazy sailors.
• When all is lost he rampages through the ship, then leaps from the mast or bowsprit into the sea.
• His land cousins in Belgium and the Netherlands sharpen millstones overnight but leave forever if given clothes.
• He turns up in the card game Doppelkopf, the children's show Pumuckl, and as the spirit of the Going Merry in One Piece.

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The Cape of Good Hope is not Africa's southern tip. That is Cape Agulhas, about 150 kilometers to the east southeast, where the warm Agulhas current meets the cold Benguela current and breeds hurricane force winds and waves up to ten stories high. The rocky peninsula matters because it is where ships stop heading south and start heading east. Around 600 BC, Pharaoh Necho II reportedly sent Phoenician sailors on a three year voyage around Africa, and Herodotus doubted their claim that the sun was on their right, the very detail that now suggests they crossed deep into the southern hemisphere. Around 130 BC, Eudoxus of Cyzicus found a wreck with a carved horse head from Gades, modern Cadiz, on the East African coast. In 1488 Bartolomeu Dias named the headland the Cape of Storms, and King John II of Portugal renamed it the Cape of Good Hope to win over investors and crews.

In 1652 the Dutch East India Company sent Jan van Riebeeck to build a supply post at Table Bay, the start of Cape Town, the Tavern of the Seas. Fencing off grazing land brought war and smallpox to the Khoikhoi, herders who had lived there for about 1,500 years. Huguenots arrived in 1687, Britain took the Cape after the Battle of Blaauwberg in 1806, and it joined the Union of South Africa in 1910. The Suez Canal sidelined the route in 1869, but the 2021 canal blockage and the 2024 Red Sea crisis sent ships from Maersk, Ikea, and Amazon back around the Cape, adding three to four weeks and causing a shortage of shipping containers.

• The 1450 Fra Mauro map describes an Indian junk blown about 2,000 miles past the Cape around 1420.
• The Cape Floristic Kingdom, the smallest of six, holds 1,100 native plant species on the peninsula alone.
• Many fynbos seeds wait for smoke chemicals called karrikins to signal it is time to germinate.
• Chacma baboons here forage in the freezing intertidal zone for shellfish and crabs.
• Luis de Camoes invented the storm giant Adamastor for the Cape in his 1572 epic poem.

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Joshua Slocum, the first person to sail single handed around the globe, never learned to swim and saw no point in it a thousand miles from land. Born into a family of 11 children near Nova Scotia's Bay of Fundy, he hated the smell of leather in his father's boot shop, left for good at 16 after his mother died, and studied mathematics, lunar observations, and dead reckoning during off watches until he earned a second mate's certificate at 18. Settling in San Francisco and becoming an American citizen, he commanded his first blue water ship by 1869, married Virginia Albertina Walker in Australia in 1871, and raised a family at sea, tethering the children to the deck in rough weather. After Virginia died in Buenos Aires in 1884 he married his cousin Henrietta and took her aboard the Aquidneck.

That voyage brought a hurricane, cholera and a six month quarantine, a pirate attack in which Slocum shot a man and stood trial before acquittal, smallpox, and a wreck off Brazil in 1887. He built the 35 foot junk rigged Liberdade from the wreckage and sailed his family about 5,500 miles home. In April 1895, at 51, he left Boston alone in the Spray, a 36 foot oyster sloop he had rebuilt after it rotted seven years in a Massachusetts field, and returned to Rhode Island in June 1898 after 46,000 miles. Sailing Alone Around the World became a bestseller, but in November 1909, at 65 and low on money, he sailed for South America and was never seen again.

• He saved his wife, children, crew, and part of the cargo when the Washington was wrecked by a gale in Alaska.
• In 1893 he delivered the torpedo boat Destroyer to Brazil partly to strike at Admiral Melo, who had ordered his quarantine, and the crew burned furniture to keep her boilers lit.
• He navigated with a cheap tin clock and lunar distances instead of a marine chronometer.
• He balanced the Spray so well that she sailed 2,000 miles across the Indian Ocean without him touching the helm.
• When Theodore Roosevelt said Slocum's adventures outshone his own, Slocum replied, "That is true, Mr. President, but I see you got here first."

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The RMS Empress of Ireland, launched in 1906 for Canadian Pacific Steamships, carried immigrants between Liverpool and Quebec City and offered new steerage cabins with doors that closed. After the Titanic she was refitted in 1912 with lifeboat room for 1,686 people, more than she was licensed to carry, yet her 24 watertight doors still had to be shut by hand. On her 96th voyage, under Captain Henry George Kendall on his first St. Lawrence run in command, she left Quebec with 1,057 passengers, including actor Laurence Irving and 170 Salvation Army members with their Canadian staff band. At 1:56 a.m. on May 29, 1914, after a fog bank swallowed the river, the Norwegian collier Storstad rammed her starboard side.

Kendall shouted for the Storstad to keep her engines ahead and plug the hole, but the current pulled the ships apart in seconds. Water poured in at 60,000 imperial gallons per second, open portholes dipped under as she listed, and longitudinal bulkheads beside the coal bunkers trapped the flood on one side. The power failed, only five lifeboats got away, and 14 minutes after impact she sank, killing 1,012 people. Lord Mersey, fresh from the Titanic hearings, blamed the Storstad's chief officer, but a 2005 investigation suggested Kendall may have changed course. A month later Archduke Franz Ferdinand was assassinated, and the war buried the story.

• Only 41 of 310 women and 3 of 138 children survived, among them seven year old Grace Hannigan, who lost both parents.
• Thrown from the bridge, Kendall clung to a wooden grate, then boarded the Storstad and told her captain, "You have sunk my ship."
• The Storstad's reverse slanting prow acted like an underwater chisel, and designers later moved to raked bows.
• Canadian Pacific won a $2 million judgment, the same value as the silver bullion the Empress carried.
• A hardhat diver died during the 1914 salvage, and Canada protected the 132 foot deep wreck in 1999.

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On June 7, 1958, about 15,000 people watched the largest ship yet built for North America's Great Lakes slide into the water. It took the sponsor three swings to break the champagne bottle, a spectator died of a heart attack, and the SS Edmund Fitzgerald dropped in sideways, drenching the crowd and slamming into a concrete pier. Financed with $7 million by Northwestern Mutual Life Insurance and built by the Great Lakes Engineering Works to the maximum size allowed by the new St. Lawrence Seaway, she was 729 feet long and hauled taconite iron ore pellets from Minnesota to mills in Detroit and Toledo, while her interior, outfitted by Detroit's J.L. Hudson Company, offered deep pile carpet, air conditioned crew quarters, and VIP staterooms. On November 9, 1975, Captain Ernest M. McSorley left Superior, Wisconsin with 29 men and over 26,000 long tons of taconite, trusting a forecast that the storm would pass south of Lake Superior.

By the afternoon of November 10 she was in 70 mph winds and waves up to 35 feet. McSorley reported lost vent covers, a starboard list, and pumps running nonstop, then lost his radar and found the Whitefish Point beacon dead. At about 7:10 p.m. he told the Arthur M. Anderson, "We are holding our own." Ten minutes later the Fitzgerald vanished from radar with no mayday. She was found in two pieces under 530 feet of water, and investigators still split between rogue waves known as the Three Sisters, failed hatch clamps, grounding on Six Fathom Shoal, and structural failure of her long, rigid, all welded hull. Gordon Lightfoot wrote his 1976 ballad after spotting a misspelling of her name in Newsweek.

• Captain Dudley Paquette of the Wilfred Sykes read the same weather data, judged the forecast wrong, and took a sheltered route along the North Shore.
• A former crewman testified that McSorley "beat the hell out of the Fitzgerald" and seldom stopped for weather.
• The Coast Guard let her load line be changed three times, cutting her freeboard by more than three feet.
• The Lake Carriers Association pushed the shoaling theory, but later surveys found no grounding damage on her hull.
• In 1995 divers recovered her bell at the families' request and left a replica engraved with the 29 crew names.

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The Sargasso Sea has no coastline. It sits inside the North Atlantic gyre, bounded by the Gulf Stream to the west, the North Atlantic Current to the north, the Canary Current to the east, and the North Atlantic Equatorial Current to the south, a clockwise vortex driven by wind and the Coriolis effect. Roughly 1,100 by 3,200 kilometers, between 20 and 35 degrees north with Bermuda near its western edge, it gathers floating mats of sargassum, a brown macroalga that lives and reproduces at the surface. Its water is clear to about 60 meters because sinking surface water keeps nutrients from welling up, making it a marine desert with golden oases. Portuguese navigators named it, and Christopher Columbus's crew neared mutiny in 1492 as he feared the weed would foul his rudders or hide reefs, echoing the poet Avienus's account of the Carthaginian explorer Himilco.

The real trap was wind, not weed: the sea overlaps the horse latitudes, where sinking air from Hadley cells creates high pressure and dead calms. That stillness makes it a nursery. Johannes Schmidt's Dana expeditions in the 1920s traced European eels, American eels, and American conger eels back to it, and European eel larvae drift about three years to reach rivers, living there over a decade before returning to spawn and die. Young loggerhead turtles shelter in the mats, and the sargassum fish, Histrio histrio, climbs through the weed on modified fins. The Global Ocean Sampling Expedition's metagenomics found millions of new genes, and 1975 estimates put the sargassum's oxygen output at about 2.2 billion liters per hour.

• Jules Verne and Ezra Pound's poem Portrait d'une Femme used the sea as an image of entrapment and stagnation.
• The same currents that gather the weed feed the North Atlantic garbage patch.
• Bacteria that eat plastic may carry absorbed pollutants up the food web through biomagnification.
• Overfishing, shipping lanes, possible oil spills, and deep sea mining add pressure.
• The Azores, Bermuda, Monaco, the UK, and the US formed the Sargasso Sea Commission in 2014, but the high seas location limits enforcement.

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James Cook was born in Yorkshire in 1728 to a farming family and at 16 became a shop boy in the fishing village of Staithes, lasting about 18 months before moving to Whitby to apprentice on colliers hauling coal in the North Sea. He taught himself algebra, geometry, trigonometry, and astronomy, earned his mariner's license, and at 26 turned down command of a merchant ship to join the Royal Navy as an able seaman in 1755. In Canada he learned plane table triangulation from army engineer Samuel Holland and combined it with hydrography, and his charts of the St. Lawrence River let General James Wolfe's forces slip through the shoals to capture Quebec. His precise record of a solar eclipse from Newfoundland caught the Royal Society's eye, and he led the Endeavour voyage of 1768 to 1771 to observe the transit of Venus from Tahiti, carrying secret orders to seek Terra Australis and claim land.

Polynesian navigator Tupaia helped him translate in New Zealand, but Cook's habit of taking hostages over thefts turned encounters violent. In June 1770 the Endeavour struck the Great Barrier Reef, and the crew threw six cannons overboard and fothered the hole with a sail packed with oakum, wool, and dung. Disease in Batavia then killed 30 men. On his second voyage, from 1772 to 1775, he became one of the first Europeans to cross the Antarctic Circle, missed Antarctica by about 75 miles, and disproved Terra Australis. His third voyage from 1776 found no Northwest Passage, and in Hawaii he arrived during the Makahiki festival honoring Lono. Returning with a broken foremast in the season of Ku, he tried to take King Kalaniopuu hostage over a stolen cutter and was killed in the surf at Kealakekua Bay.

• He chose a flat-bottomed Whitby collier because it could run aground or be beached for repairs without capsizing.
• The K1 chronometer, a copy of John Harrison's design, solved longitude at sea for his second voyage.
• Strict hygiene and fresh food meant zero scurvy deaths, though he credited sweet wort and malt, and he won the Copley Medal.
• Expedition scientists killed their pet dog to make broth when an intestinal blockage left him starving.
• His remains were identified by a scar on his right hand from a powder horn explosion in Newfoundland.

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On the night of February 17, 1864, the H.L. Hunley became the first combat submarine to sink an enemy warship. It grew out of the Union blockade strangling Southern ports, which led New Orleans financier and customs official Horace Lawson Hunley and builder James McClintock to try underwater attack. Their first boat, the Pioneer, was tested in the Mississippi in 1862 and scuttled as Union forces took New Orleans. Their second, the American Diver, built in Mobile, tried galvanic battery propulsion and a steam engine before foundering in rough water in Mobile Bay. The third boat was nearly 40 feet long and about four feet three inches in diameter, with 16.5-inch hatches, ballast tanks at both ends, droppable iron keel weights, and seven men turning a hand crank for about three and a half horsepower and four knots on the surface.

Seized by the Confederate military in Charleston, it killed its crews twice. On August 29, 1863, Lieutenant John A. Payne stepped on the diving plane lever with hatches open and five men drowned. On October 15, Hunley himself died with seven others when it stuck nose-first in harbor mud. General P.G.T. Beauregard still found volunteers, but barred full dives. Lieutenant George E. Dixon then rammed a 135-pound black powder spar torpedo into the 1,240-ton sloop USS Housatonic, which sank in three minutes with five of her crew, and the Hunley vanished. Raised on August 8, 2000, it held a crew still seated at their stations, pumps and keel weights untouched. A copper sleeve found in 2013 showed the charge was fixed to the spar, and Duke University blast experiments concluded the shockwave killed the crew instantly through pulmonary blast trauma.

• Dixon carried a $20 gold coin that had stopped a bullet at Shiloh, engraved "my life preserver", and it was found near his remains.
• A blue light reported after the attack was likely a Union rescue flare mistaken for Dixon's signal.
• E. Lee Spence claimed a 1970 find, while Clive Cussler's diver Ralph Wilbanks located the wreck in April 1995, sparking lawsuits.
• Smithsonian anthropologist Douglas Owsley's team found four crewmen were American-born corn eaters and four were Europeans raised on wheat and rye.
• The crew was buried at Magnolia Cemetery in Charleston in 2004.