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The trireme, a warship with three overlapping banks of oars, dominated the Mediterranean from the seventh through the fourth centuries BC and became the foundation of the Athenian Empire. About 37 meters long and only six meters wide, it was built from light pine and fir using a shell-first mortise and tenon method that took roughly 6,000 man-days per hull. A 47 millimeter cable called the hypozomata, cranked to about 13.5 tons of tension, ran from bow to stern to resist hogging and sagging, and exporting these cables from Athens was a capital offense. The crew of about 200 included 170 rowers, overwhelmingly free, paid citizens and resident foreigners, stacked in three tiers as thranites, zygites, and thalamites, with 108 of them unable to see the water and keeping time to a piper and chants recorded by Aristophanes.

Pine soaked up water and the hull had no cargo room, so a fleet had to beach every night, and that weakness shaped both its tactics and its defeat. Athenian crews stripped sails and masts before battle and used the periplus and diekplous to shear enemy oars with the bronze ram, while Sparta and Persia packed their decks with hoplites and archers. Themistocles poured a silver mine windfall into 200 triremes that won at Salamis, but at Aegospotami a Persian-funded Spartan fleet caught the Athenians beached while crews foraged for water and took 170 ships in a single day. In the 1980s the full-scale replica Olympias reached nine knots with a volunteer crew and turned 180 degrees in 60 seconds.

• Ramming at a 60 degree angle needed only four knots to break through, while a 30 degree angle demanded eight.
• Each crewman needed about two gallons of fresh water a day.
• Victors often cut off the right hand or thumb of captured rowers so they could never row again.
• A team of 140 men could carry a trireme out of the water.
• Modern rowers on Olympias felt cramped because they average about two inches taller than ancient Greeks.

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The Baychimo began in 1914 at Gothenburg, Sweden as the Ångermanelfven, a 230 foot, 1,300 ton steel cargo steamer with a triple expansion engine that made a steady 10 knots on Baltic runs between Hamburg and Sweden. After World War I it went to Britain as German reparations, and in 1921 the Hudson's Bay Company bought it, renamed it Baychimo, and based it at Ardrossan, Scotland to supply trading posts along Canada's Victoria Island coast. Though not an icebreaker, it made nine successful voyages trading provisions for furs. In 1931 it pushed too late into the season, and on October 1, loaded with furs, it was caught in the pack ice. The crew walked half a mile to Barrow, Alaska, now Utqiagvik, returned when the ice briefly freed the ship, and were trapped again by October 8.

On October 15 the company flew out 22 crew, while 15 men built a wooden shelter onshore to guard the cargo, fearing an ice squeeze could crush the hull. After a blizzard on November 24 the ship was gone, and they assumed it sank, until an Inuit seal hunter reported it about 45 miles away. The crew removed the most valuable furs by air and abandoned it. Its rounded hull likely let the ice lift it rather than crush it, and the empty ship drifted for decades: Leslie Melvin saw it in January 1932, Inupiat were trapped aboard for ten days by a storm in March 1933, and botanist Isobel Wylie Hutchison boarded it that August. It was last seen in 1969, frozen in the Chukchi Sea, 38 years after its crew left.

• In November 1939 Captain Hugh Poulsen began rigging a tow but fled when ice floes closed in.
• Prospectors spotted it in spring 1932, and Inuit saw it on the Beaufort Sea coast in 1962.
• The leading theory is that decades of freeze and thaw fatigued the steel until it sank.
• A 2006 Alaskan effort with sonar and satellite imaging never found a trace of it.
• A 1971 textbook called Galaxies featured it as Alaska's Phantom Ship.

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In late October 1991 a buoy on the Scotian Shelf off Nova Scotia recorded a wave of 100.7 feet, driven entirely by wind. The setup began with the June 1991 eruption of Mount Pinatubo, whose aerosols cooled the globe by about half a degree Celsius and may have shifted the jet stream. A cold front left the US East Coast and became an extratropical low off Nova Scotia, but a high pressure ridge from the Appalachians to Greenland blocked it, forcing it southeast and then west in rare retrograde motion. On October 29 it absorbed Hurricane Grace. Its pressure fell to 972 millibars against a gradient of about 70 millibars, and days of hurricane force wind over a long fetch built enormous seas.

The Gloucester swordfishing boat Andrea Gail made last contact on October 28 about 180 miles northeast of Sable Island and was lost with six crew. The Coast Guard rescued 25 people at sea, but a New York Air National Guard HH-60G could not refuel in midair and ditched 90 miles south of Montauk; the cutter Tamaroa pulled four of five crew from 30 foot seas after six hours, and pararescue jumper Arden Richard Smith was never found. Onshore the storm caused over $200 million in damage across seven states, raising a 14.3 foot tide in Boston. By November 1 it formed an eye over the Gulf Stream and became a hurricane with 75 mph winds, but forecasters left it unnamed rather than announce Hurricane Henri to a battered coast.

• It dumped a record 4.4 inches of snow on Newfoundland while flooding the Hudson and Hackensack rivers.
• Thirty foot waves blew out windows at President George H. W. Bush's Kennebunkport home.
• The ocean swept away 50,000 lobster traps in New Hampshire and a row of houses on Fire Island.
• Highway 12 on North Carolina's Outer Banks was partly washed out, and 15 foot waves reached Puerto Rico.
• Forecaster Robert Case's description of a perfect convergence gave Sebastian Junger his book title.

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On August 11, 1979, 303 yachts left Cowes for the Fastnet Race, the 605 nautical mile finale of the Admiral's Cup series, rounding Fastnet Rock off southern Ireland and finishing at Plymouth. The BBC shipping forecast called for southwesterly force four to five, perhaps six or seven. Instead a depression labeled Low Y underwent explosive cyclogenesis on August 13, bottoming at 979 hectopascals over Wexford by the 14th. The Met Office assessed force 10, crews logged force 11, and the inquiry reported 60 knot winds. The deadliest element was the sea: a rapid wind shift sent new waves across the old swell, building steep pyramidal waves around 50 feet that dropped boats off their faces, snapped rigs, and rolled yachts through 360 degrees. Twenty four boats were abandoned, at least 75 capsized, and five sank.

More than 4,000 people joined the largest peacetime rescue of its kind, saving 136 sailors from about 80 vessels in distress. HMS Broadsword coordinated with RAF Nimrods, and 15 Navy helicopters from Culdrose and Prestwick flew over 100 hours. The Dutch HNLMS Overijssel, the Irish LÉ Deirdre, and USS Holland helped, the RORC escort yacht Morningtown relayed positions by VHF, and RNLI lifeboats stayed out up to 75 hours. At the front, Peter Blake's Condor of Bermuda flew a spinnaker in the gale to take line honors, cutting nearly eight hours off the record, while Ted Turner's Tenacious won on handicap. Fifteen competitors died, along with six people aboard two observer yachts, four of them from Buck's Fizz, for 21 in all.

• Only 86 of the 303 starters finished the race.
• Lin Pardey noted that none of the yachts that hove to were capsized or seriously damaged, but the inquiry did not endorse heaving to as a universal answer.
• John Rousmaniere wrote that there is nothing always about a storm at sea except its danger.
• Jim Kilroy of Kialoa raced on with broken ribs against Condor.
• A Cowes memorial lists 19 names, and the Cape Clear Island memorial was updated in 2015 to include all 21.

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Dhow is a European catchall for Indian Ocean ships with triangular lateen sails; the word probably comes from Swahili for vessel, and local sailors used specific names such as markab, khashab, and falukah, related to the Quranic fulk for Noah's Ark. The basic design likely arose in India between 600 BC and 600 AD, long before Portuguese caravels arrived in the late 15th century, which rules out the myth that the sambuk came from them. The oldest surviving type is the Somali beden, and Somali traders carried frankincense, myrrh, and gold to Egypt, Babylon, and farther east. In 1414 they brought a live giraffe to the Ming court of the Yongle Emperor, possibly transferring it to Zheng He's fleet, a feat made possible by deep keels and heavy ballast.

For centuries Hadhrami Yemenis and Omanis sailed to Beypore in Kerala, India for custom hulls of rot resistant teak whose planks were sewn together with coconut coir rather than nailed, a flexible hull the Malayalam language calls uru that absorbs shocks from waves and reefs. By the 1920s Al Hudaydah in Yemen built smaller acacia wood coastal dhows with movable sails for the Red Sea's erratic winds. Navigators measured the pole star with the kamal, a wooden block on a knotted string held in the teeth, and trade followed the monsoon: south in winter, north after the winds reversed, with long waits that built multicultural port cities. Types included the cargo baghlah, or mule, the boom with its tapering stern, and the broad jahazi used for pearl diving around Bahrain and Oman.

• Dhows appear throughout the stories of the Thousand and One Nights and powered the Persian Gulf pearl trade.
• Arab booms keep a high sweeping prow, while Indian versions trim it down.
• Dhows also carried the Red Sea and Indian Ocean slave trades, and Captain G. L. Sullivan's 1873 book details Royal Navy patrols against them.
• Alan Villiers sailed on dhows in the late 1930s, and some still carry dates and fish to East Africa and mangrove timber back.
• Kuwait's Al Hashemi II holds the Guinness record as the largest wooden dhow but has never floated.

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The sperm whale has the largest brain on Earth, more than five times heavier than a human's, and a head that fills a third of a body up to 52 feet long, with its blowhole pushed to the front left so its spray angles sideways. It routinely dives about 2,250 meters, over 7,300 feet, for more than an hour. Flexible cartilage lets its ribcage and lungs collapse under the pressure, yet older whales' skeletons show avascular necrosis, bone death like that from decompression sickness, while calves' bones are smooth. The head holds the spermaceti organ, a waxy fluid that whalers mistook for semen. Air forced through the monkey lips makes clicks that bounce through the wax and out as focused sonar reaching 236 decibels, the loudest animal sound known.

Tag studies on whales and squid showed the clicks lose too much pressure to stun prey, so they serve range and resolution. A male eats about 3% of its weight a day in squid, sucked in whole, since whales with deformed jaws or no teeth stay healthy; the lower teeth, up to 26 per side at a kilogram each, are for fights between males. Females and calves live in tropical matriarchal units of six to nine, sometimes 20, while males roam toward the poles. Against orcas the adults form the marguerite, heads in and tails out around the calves. Families speak in rhythmic click patterns called codas, and clans of thousands share one dialect and do not mix with other clans in the same waters. In 1820 a sperm whale rammed and sank the Nantucket whaleship Essex, inspiring Moby Dick.

• Saucer sized sucker scars on their skin and undigested beaks in their stomachs show their fights with giant and colossal squid.
• Iron rich feces released at the surface fertilize phytoplankton blooms that pull carbon down, a cycle called the whale pump.
• Spermaceti oil lit city street lamps and lighthouses and lubricated early industrial machinery.
• Ambergris forms around irritating squid beaks in the gut and was prized as a perfume fixative.
• Whaling cut an estimated 1.1 million sperm whales to about 360,000, leaving an estimated extra two million tons of carbon in the air each year.

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On January 23, 1960, Jacques Piccard and US Navy Lieutenant Don Walsh sealed themselves into the Trieste's steel sphere, about 7 feet across with walls five inches thick, and sank toward the Challenger Deep in the Mariana Trench. The bathyscaphe was the design of Swiss physicist Auguste Piccard, who inverted his stratospheric balloon idea: a large float filled with gasoline, which resists compression, provided lift, while 18 tons of iron shot held by electromagnets in two hoppers provided weight. If power failed, the magnets released the shot and the craft rose. Built in the Free Territory of Trieste with support from pacifist collector Diego de Henriquez, it was bought by the US Office of Naval Research in 1958 for $267,000 and fitted with a new Krupp sphere forged in three sections for Project Nekton.

Towed out about 200 miles from Guam by the USS Wandank, the Trieste took 4 hours and 47 minutes to descend. At about 9,000 meters a loud crack shook the sphere: the outer pane of the acrylic viewport had fractured, but its cone shape meant pressure only seated it tighter, so they kept going. They landed on pale diatomaceous ooze at an indicated 11,521 meters, later revised to 10,916, where the cabin fell to about 7 degrees Celsius. Voice messages by underwater telephone took seven seconds each way. They reported flatfish, but fish are thought unable to live below about 8,000 to 8,500 meters, and biologists now suspect a sea cucumber. In 1963 the Trieste found the wreck of the submarine USS Thresher at 8,400 feet.

• Standard submarines use compressed air for buoyancy, which cannot work against about 1,250 kilograms of pressure per square centimeter at the bottom.
• The new sphere's specific gravity was 2.6 times that of seawater, and it weighed over 14 metric tons in air.
• External quartz arc lights worked at full depth while directly exposed to the pressure.
• The ascent took 3 hours and 15 minutes after about 20 minutes on the bottom.
• The Thresher search earned the Trieste the Navy Unit Commendation, and it was retired in 1966, its sphere reused in Trieste II.

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The blue whale's heart weighs about 180 kilograms, and the longest one measured was roughly 30 meters. Studies in 2024 and 2025 corrected inflated weight estimates for the extinct whale Perucetus and the titanosaur Bruhathkayosaurus, leaving the blue whale as the heaviest animal ever. It eats about four tons of krill a day by lunge feeding: accelerating into a swarm, opening its jaws to about 80 degrees, and expanding 60 to 88 throat pleats to engulf up to 220 tons of water before pushing it out through keratin baleen. A lunge into sparse krill costs more energy than it returns, but a dense swarm can pay back up to 240 times the cost. On dives to 315 meters its heart slows to two beats a minute, then races to 37 at the surface.

Scientists age blue whales by counting light and dark layers in earplugs of wax that can exceed half a meter, laid down by yearly cycles of feasting and fasting; the oldest counted was 110. Calves are born six to seven meters long and gain about 90 kilograms a day on milk over 40% fat. A 2024 genomic study found about 3.5% of the North Atlantic blue whale genome comes from fin whales, with genes flowing only one way. Since the 1960s their songs, at 8 to 25 hertz, have dropped steadily in pitch, and in early 2025 researchers found they sang less during California marine heatwaves. Industrial whaling killed over 350,000 in the Antarctic in the first half of the 20th century, cutting about 140,000 animals to 10,000 to 25,000.

• A 50 ton blue whale may have a brain of only about 3.6 kilograms.
• They roll up to 180 degrees during lunges to hit the densest part of a krill swarm.
• One theory says deeper songs signal larger bodies as populations recover, while a 2022 study suggests a spreading cultural fad.
• Protection came in 1966, though Soviet whaling continued illegally into the 1970s.
• Nursing mothers pass stored pollutants from their blubber to calves through milk, and 1800s whalers called them sulfur bottoms for the diatoms on their bellies.

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The word schooner likely comes from an old Scots term for skipping stones across water. A schooner has two or more masts, all fore and aft rigged, with the foremast no taller than the mainmast. Instead of pushing like a square sail parachute, its sails work like a sideways wing while the keel resists sliding, so the ship can sail much closer to the wind and zigzag against it. Gaff rigs, staysail rigs, and topsail schooners all appear. Dutch paintings show the layout on Amsterdam yachts in the early 1600s, it reached New Amsterdam by 1627, the British launched the Royal Transport in 1695, and from about 1713 New England and Atlantic Canada refined and named it. Pirates, privateers, blockade runners, and slavers loved it because it could slip away upwind and needed only a small crew working from deck.

Pilot boats, opium clippers, packet boats, and fruit schooners racing oranges and lemons from the Azores to Britain relied on the rig, as did Grand Banks fishermen and flat bottomed British coasters that sat on the beach at low tide. Then the Industrial Revolution supersized it. Tern schooners like the Wawona hauled timber, and yards in Bath, Maine and on Penobscot Bay built 45 five masters and 10 six masters between 1880 and 1920. The six masted Wyoming, the largest wooden ship ever built, bent with every wave, a stress called hogging and sagging, and leaked so badly that steam pumps ran around the clock. Steam donkey engines raised the sails for crews of 11 to 14. The steel Thomas W. Lawson was the only seven masted schooner, 395 feet long with 43,000 square feet of canvas.

• Baltimore Clippers raked their masts backward to make the boats faster and more responsive.
• The yacht America, namesake of the America's Cup, was a schooner built for racing.
• The three masted Atlantic crossed the ocean in 12 days and 4 hours in the 1905 Kaiser's Cup, a monohull record that stood nearly a century.
• Bluenose, a working Nova Scotia fishing schooner from 1921 to 1946, beat purpose built racing yachts.
• The polar schooner Fram carried Fridtjof Nansen and Roald Amundsen into the ice.

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In 2019 archaeologists clearing a burial ground under London's Euston station for a high speed rail line found a coffin whose lead plate named Matthew Flinders, lost for over 150 years. Born in 1774 in Lincolnshire, a surgeon's son, he joined the navy at 15 after reading Robinson Crusoe and sailed with William Bligh on his second breadfruit voyage through the Torres Strait. At the Glorious First of June in 1794 he saw Captain Pasley's leg torn off by a cannonball and turned toward exploration. In New South Wales he and surgeon George Bass charted the coast in tiny open boats named Tom Thumb, helped by Aboriginal men who guided them to Lake Illawarra. In 1798 they sailed the sloop Norfolk around Van Diemen's Land, proving Tasmania an island and naming Bass Strait.

Backed by Joseph Banks, Flinders took HMS Investigator in 1801 with artists, an astronomer, and Bungaree, an Aboriginal man who served as a diplomat. In April 1802 he met Nicolas Baudin's French ship Géographe at Encounter Bay and shared charts despite the war. The rotting Investigator barely finished circling the continent in 1803. Heading home, he was wrecked on the Porpoise, sailed a small boat back to Sydney for rescue, and then stopped the leaky 29 ton Cumberland at French Mauritius. His passport named the Investigator, and Governor Decaen held him as a spy from 1803 to 1810 while Baudin's crew published French names for his coasts. In captivity he drew his 1804 map pushing the name Australia, and he died at 40 on July 19, 1814, a day after his book appeared.

• Flinders refused Decaen's dinner invitation, a slight that helped harden the spy charge.
• He argued Australia sounded better than New Holland, despite Banks preferring older names, and the Admiralty adopted it about 10 years after his death.
• He first documented the dodge tide in South Australia, when the water barely moves for a day or two.
• The Flinders bar, a vertical soft iron bar, cancels a ship's own magnetism near the compass.
• In July 2024 his remains were reburied in the church at Donington, his childhood village.