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The word galleon traces back to the Byzantine Greek galea, a kind of shark, and the ship earned the comparison. In the 1550s Spanish commanders such as Pedro Menendez de Aviles and Alvaro de Bazan reworked the bulky carrack, whose towering forecastle acted like a sail that could never be lowered. They cut the forecastle down, lengthened and narrowed the hull, and added a beakhead. Galleons were carvel built with flush planks, oak keels, and flexible pine masts, and they paired square sails on the fore and main masts with lateen sails aft for maneuverability. Five galleons could be built for the cost of three carracks, funded by syndicates dividing shares into eighths or sixteenths, and armed with long range demi-culverins firing nine pound balls.

The episode also looks at the grim math behind the rigging: block and tackle systems let a surviving fraction of a crew bring a ship home after scurvy and disease. Names were messy, and 26 documents call the Red Bay wreck San Juan a nao, never a galleon. In the Mediterranean, galleons first needed galleys to tow them, but at Cape Celidonia in 1616 a Spanish galleon fleet beat a larger Ottoman galley fleet with broadsides. Galleons gave way to specialized ships of the line during the Anglo-Dutch Wars.

• At Tunis in 1535 the Portuguese galleon Sao Joao Baptista, nicknamed Spitfire, carried over 360 bronze guns.
• Manila galleons crossing between the Philippines and Mexico reached 2,000 tons.
• Francis Drake captured the Nuestra Senora de la Concepcion, nicknamed Cacafuego, in 1578 with a year's worth of American treasure.
• The English corsair Jack Ward defected to the Ottomans and taught them galleon construction.
• The Japanese built San Juan Bautista crossed the Pacific to Mexico in 1614 carrying a diplomatic mission.

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The Dutch Golden Age was built less on warships than on a pear shaped, lightly armed cargo ship called the fluyt, developed by shipwrights in Hoorn in the 16th century. Other European merchant ships were built to double as warships, with thick hulls, reinforced gun decks, and crews large enough to fight. The fluyt dropped most of the guns to maximize cargo. Its hull was narrow at the deck and bulged below the waterline, and with ballast and cargo packed low it was stable and drew little water, letting it sail straight up to shallow Dutch and Baltic quays. Tall square rigged masts caught steady winds aloft, a lateen mizzen helped it work against the wind, and block and tackle let a crew of perhaps 12 to 15 handle a ship that elsewhere needed 40 to 60.

Wind powered sawmills turning out standardized parts made a fluyt cost about half as much as rival ships, and merchants accepted occasional losses to privateers as a cost of cheap transport. By 1670 the Dutch merchant marine controlled 568,000 tons of shipping, about half the European total. The episode also debunks a popular tax story and follows the design's spread to England and France, a wreck in the Baltic, and a working replica in Nova Scotia.

• Sound Toll registers from 1562 to 1632 show officers assessed ships from bills of lading, not by measuring deck width.
• England captured many fluyts as prizes in the Anglo-Dutch Wars and leased others to carry colonists to America.
• By 1680 the French navy called all its large cargo ships flutes.
• A fluyt found in the Baltic in 2003 carried a carved swan on its transom and three carved flowers on its rudder, linking it to the Swan.
• A replica of the Hector, which carried 189 Scottish immigrants to Nova Scotia in 1773, was built in Pictou in 2000.

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Poseidon's earliest worshippers would not have asked him to protect their ships. In the Mycenaean period, roughly 1600 to 1100 BC, Linear B administrative tablets from centers like Pylos and Thebes show him outranking Zeus, receiving major offerings under the title wanax, a supreme overlord. He was an inland, chthonic god of earthquakes, underground water, and horses. Linguists split on his name: husband of the earth, from da and posis, or a root tied to flowing water that some link to river names like the Danube and Don. Living on limestone karst, where rivers vanish into sinkholes, the Greeks reasoned that underground water eroding the rock caused earthquakes, so the water god was the earth shaker. As populations moved to the coasts after the Bronze Age collapse, he became god of the sea.

The episode then reads his myths as biography. In Arcadia, Rhea fed Cronus a foal instead of baby Poseidon, a survival of his horse cult. After the Titanomachy, he drew the sea by lot while Zeus took the sky. His bids to be patron of cities failed: he gave Athens a saltwater spring, lost to Athena's olive tree, and flooded the Attic plain; he lost Argos to Hera and dried up its water. His children were monsters and horses, and Plato made him the founder of Atlantis.

• On Rhodes, one tradition says he was raised in secret by the Telchines and a nymph.
• After King Laomedon of Troy refused to pay him for building the city walls, he sent a sea monster against the Trojans.
• Greeks threw live horses and bulls from cliffs into the sea as sacrifices to him.
• When Demeter took the form of a mare to escape him, he became a stallion, and she bore the immortal horse Arion.
• For Cleito on Atlantis he carved concentric rings of water and land and fathered five sets of twins, the eldest named Atlas.

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On January 10, 1992, a storm near the International Date Line swept 12 containers off the Ever Laurel, bound from Hong Kong to Tacoma, Washington. One held 28,800 Friendly Floatees made in China for The First Years Inc.: yellow ducks, red beavers, blue turtles, and green frogs. Their cardboard packaging dissolved within hours, and because the toys had no drain holes they could not sink. Seattle oceanographer Curtis Ebbesmeyer, who had already tracked 61,000 Nike shoes lost from the Hansa Carrier in 1990, saw a huge drift experiment. Traditional drift bottles came back at about 2 percent, so this spill promised hundreds of data points. The first toys turned up near Sitka, Alaska on November 16, 1992, and by August 1993 beachcombers had reported about 400 along the eastern Gulf of Alaska.

Ebbesmeyer and his colleague James Ingraham fed the landfalls into OSCURS, an ocean surface current model built on atmospheric pressure data going back to 1967, and the simulated paths matched. The toys showed the North Pacific gyre circuit ran faster than earlier models suggested. Some reached Washington State in 1996, while others were predicted to travel to Japan, return toward Alaska, pass through the Bering Strait, and ride Arctic ice for years into the North Atlantic.

• The First Years offered a $100 U.S. savings bond in 2003 for verified Floatees found in New England, Canada, or Iceland.
• 2004 was a peak year for Atlantic recoveries, 12 years after the spill.
• Sunlight bleached the ducks and beavers white, while the turtles and frogs kept their color.
• In July 2007 a duck found in Devon was hailed as a Floatee until Simon Boxall of the National Oceanography Centre, Southampton showed it was a modern local toy.
• The story inspired Donovan Hohn's Moby-Duck and children's books by Eve Bunting and Eric Carle.

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Sailors once drank eight pints of beer a day because water spoiled in wooden casks. After England took Jamaica in 1655, rum gradually replaced beer, and each man got half a pint of 95.5 proof navy spirit daily, with predictable drunkenness, illness, and discipline problems. In 1740 Vice Admiral Edward Vernon ordered the rum mixed four parts water to one and served in two halves, before noon and after the workday. Watered rum spoiled quickly, which killed the practice of hoarding rations for a binge and devalued rum as shipboard currency. Sailors named the drink after Vernon's nickname, Old Grog, from his stiff grogram cloth coat, and the procedure entered Royal Navy regulations in 1756. A competing theory credits coopers called groggers who rinsed empty rum barrels with boiling water.

The episode busts the myth that Vernon added citrus to cure scurvy: his order let thrifty sailors buy sugar and limes to make the drink palatable. It follows the daily ritual of up spirits at 11 a.m., Royal Marines guarding the tub, and leftovers poured into the scuppers, then the drink's spread. The U.S. Navy swapped in rye whiskey and ended the ration on September 1, 1862. Britain held on until the Great Rum Debate of January 28, 1970 and Black Tot Day on July 31, 1970.

• Sailors guilty of drunkenness were punished with six water grog.
• American sailors called Navy Secretary Robert Smith's whiskey version Bob Smith.
• Ship owners earned a 10 percent insurance premium return for voyages completed without crews drinking spirits.
• Modern U.S. military dining ins serve a punitive grog from a toilet bowl, with a nonalcoholic version made with hot sauce and mayonnaise.
• In Australia grog means any alcohol, in Sweden a simple two ingredient highball, and in France, Belgium, and the Netherlands a hot tea, lemon, honey, and rum remedy.

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Telling a coworker the boss keelhauled you sounds harmless until you know what the Dutch word kielhalen, to drag along the keel, meant at sea. A heavy rope was looped under a ship's hull, the victim was tied to one end and thrown overboard, and his own crewmates hauled him beneath the barnacle crusted bottom to the other side. Some accounts describe dragging from bow to stern. The crew's pace decided his fate: too fast shredded him on the hull, too slow drowned him. Despite pirate movies, there is little evidence pirates used it. The earliest definite mention is the Byzantine Rhodian Sea Law of around 700 AD, which prescribed keelhauling as a punishment for piracy.

The episode traces possible ancestors: Greek vases from 500 BC and Herodotus, debated as showing keelhauling or the strappado, and the ducking Nathaniel Boteler described in 1685, when very foul offenders were also drawn under the keel. Historians credit William of Orange with introducing it to the Dutch navy. On October 11, 1652, under Jan van Riebeeck of the Dutch East India Company, the sailor Jan Blank was keelhauled for deserting for nine days. By 1880 the practice had become an embarrassment, and after a report from Italy claimed a keelhauling aboard HMS Alexandra, George Shaw Lefevre flatly denied it in Parliament.

• Forcing crewmates to haul the rope made the whole ship complicit and discouraged solidarity against the captain.
• Jan Blank's sentence added 150 lashes and two years of enslavement to the keelhauling.
• In 1673 Cornelis Evertsen the Youngest ordered sailors keelhauled for murder.
• English writers William Monson and Nathaniel Boteler both recorded its use on English ships in the 17th century.
• Survival was possible, and the sources include records of men who lived through it.

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The classic anchor shape on a sailor's tattoo caused almost as many problems as it solved. This episode explains how anchors really work, starting with the myth that weight alone holds a ship. Bronze Age stone anchors, Maori stones for waka, and Greek baskets of stones or lead filled logs relied on mass and friction, but water's buoyancy makes a rock lighter and a storm's pull too strong for any liftable weight. The shift to hooking came early: iron flukes on anchors from the Roman Nemi ships built for Caligula, and a 10th century iron anchor with a perpendicular wooden stock from the Ladby ship burial in Denmark, a crossbar that forces the flukes to turn down into the seabed.

The real key is scope, the ratio of rode to depth, at least four to one in calm weather and up to ten to one in a storm, so the pull stays horizontal. Heavy chain sags into a catenary curve that absorbs gusts as the ship must lift it off the bottom. From there the episode follows the design race: the fouling prone Admiralty pattern, the stockless anchor of around 1821 that stows in a hawsepipe but rolls out of the mud, the CQR plow, the Danforth, and modern roll bar scoop anchors such as the Rocna, Spade, and Mantis.

• Mathematician Geoffrey Ingram Taylor invented the CQR plow anchor in 1933, which can plow a furrow and pop out under extreme loads.
• Richard Danforth's 1940s anchor for landing craft can kite across the bottom like a wing in strong current.
• A roll bar makes it impossible for a scoop anchor to rest upside down, tipping its sharp toe into the mud.
• Robert Stevenson's 1807 mushroom anchor for the Bell Rock lighthouse light vessel buries itself in silt and can hold up to ten times its weight.
• In kedging, crews rowed a kedge anchor ahead and hauled a becalmed warship to it by marching around the capstan.

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Before dry docks, crews careened ships by grounding them at high tide and waiting for the water to drop, as the English warship Grace Dieu was bedded in the mud of the River Hamble in 1434 behind a brushwood and clay wall. This episode follows the long effort to empty water from around a hull instead. The Phoenicians built covered slipways at Kition in Cyprus around the 5th century BC, and Carthage had up to 180 dry dock ramps that Rome took over in 146 BC. Athenaeus described a flooded and drained trench for Ptolemy IV's giant tessarakonteres around 221 BC, a claim historian Joseph Needham disputed for lack of physical evidence. In 1088, Shen Kuo's Dream Pool Essays recorded a basin at Jinming Lake where water wheels drained water so two 200 foot imperial dragon ships settled onto beams, after which the basin was roofed as a hangar.

Europe's oldest surviving dry dock, built at Portsmouth in 1495 for Henry VII, was sealed with a rock and clay bank that took up to 29 days to dig out and was drained by horse powered bucket chains. Modern graving docks use gates, steam pumps, and a docking plan of keel and bilge blocks placed under a ship's load bearing ribs while divers guide the landing. Floating docks sink by flooding their ballast tanks and rise by pumping them out, and the same idea now builds storm barriers and tunnels.

• Engineers cut recesses into dock floors so the bulbous sonar domes of anti submarine warships hang free.
• Britain towed an iron floating dock across the Atlantic to Bermuda in 1866 because the porous limestone ruled out a graving dock.
• The U.S. Navy's World War II AFDB-1 floating dock was 1,000 feet long and assembled from sections at bases like Guam.
• In 2018 Russia's PD-50 sank after a power failure, dropping a crane onto the carrier Admiral Kuznetsov.
• The Oosterscheldekering's 65 concrete piers, each 18,000 tons, were built in a dry dock and floated out.

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In the early 1920s, Frederick Stanley Mockford, the officer in charge of radio at Croydon Airport in England, was asked to invent a spoken distress word that English and French crews on the Croydon to Le Bourget route could both understand. He chose mayday, a phonetic version of the French m'aider, from venez m'aider, come help me. Grammatically it is an infinitive, closer to shouting helping me than help me, but it cut through noise. SOS worked well in Morse code, yet the hissing sibilant S vanished into the static of AM voice radio and biplane ignition noise, while the voiced M and D and open vowels of mayday punched through. The 1927 International Radiotelegraph Convention in Washington adopted mayday as the radiotelephone distress call alongside SOS.

The episode then walks through the protocol built around the word: saying it three times, and the FAA list of station, call sign, aircraft type, emergency, weather, intentions, position, altitude, fuel in minutes, and souls on board. Fuel in minutes tells rescuers how long the aircraft can stay up and how much fire risk to plan for. Pan-pan, from the French panne for breakdown, signals urgency short of grave danger. Controllers impose radio silence with seelonce mayday and end it with seelonce fini, and ICAO warns against plain phrases like declaring emergency because they force controllers to interpret.

• Making a false distress call is a federal crime in the United States.
• A station that hears a vessel unable to transmit can send a mayday relay on its behalf.
• Pan-pan medico was once used to flag medical transports but is no longer in official use.
• In 1998 the crew of Swissair Flight 111 upgraded from pan-pan by radioing that they were declaring emergency.
• Older terms such as seelonce distress and prudence were retired in 2007.

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Christopher Columbus was born in Genoa around 1451, the son of a wool weaver who also ran a cheese stand, and he taught himself Latin, Portuguese, and Castilian. After surviving a shipwreck off Portugal in 1476 he reached Lisbon, the center of maritime exploration, married into a Portuguese noble family with access to his late father in law's charts, and worked in a cartography shop with his brother Bartholomew. He read Marco Polo and Ptolemy selectively, then built his pitch on three errors: he read the astronomer al Farghani's figures in short Roman miles instead of Arabic miles, shrinking the globe by about 25 percent; he stretched Eurasia too far east; and he put Japan about 2,400 nautical miles west of the Canary Islands when the real distance is roughly 10,600.

Educated Europeans knew the Earth was round, and the experts who rejected him in Portugal and Spain were arguing about its size, correctly. Spain kept him on a small retainer until the Granada War ended in January 1492, and the clerk Luis de Santangel persuaded Queen Isabella with a risk and reward case. He landed on Guanahani in the Bahamas in October 1492, insisted he had reached Asia, and as governor of Hispaniola imposed forced labor that, with disease, the source describes as genocide. In 1500 the royal investigator Bobadilla sent him home in chains, and he died in 1506 still demanding the wealth his contracts promised.

• He planned to ride the trade winds using the volta do mar, a technique learned from Portuguese sailors.
• Portugal lost interest after Bartolomeu Dias rounded the southern tip of Africa.
• He captured several Arawaks and demanded they lead him to the source of their gold ornaments.
• His heirs fought the Spanish crown for decades in the lawsuits known as the pleitos colombinos.
• His remains moved from Spain to Santo Domingo, Havana, and Seville, and DNA testing has been used to sort out where he lies.