Westbrook, Connecticut: The Turtle — The First Combat Submarine
The Turtle, the world’s first combat submarine, was built by David Bushnell — a Westbrook farmer’s son who entered Yale at thirty-one.
Three stories posted across one week in August 2026 — the farm boy who proved gunpowder burns underwater, the oak egg he built to carry it, and the night one man cranked it beneath a British flagship. Each part below is the full post as published, with the reel it accompanied.
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Part I — The Shore · Part II — The Machine · Part III — The Vanishing
QUICK FACTS — THE TURTLE
› Settled 1648 as the Oyster River Quarter, the west parish of old Saybrook — named Westbrook in 1810, its own town in 1840
› David Bushnell born 1740 on a Westbrook farm; he worked it nearly thirty years, then entered Yale in 1771 at thirty-one
› At Yale he proved gunpowder detonates underwater — inventing the naval mine, and with it the problem the Turtle was built to solve
› The Turtle: an oak shell taller than a man, one operator, roughly thirty minutes of air
› Hand-cranked screw propeller, two brass pumps, and hundreds of pounds of lead below for trim — part of it droppable
› Foxfire, a bioluminescent fungus, lit the compass and depth gauge; winter cold killed the glow and grounded the boat
› Sgt. Ezra Lee of Old Lyme attacked HMS Eagle in New York Harbor on September 6, 1776
› Lost weeks later when the sloop carrying it was sunk; no drawing from Bushnell's hand survives
› Bushnell later lived in Georgia as “Dr. Bush,” his identity known to neighbors only after his death
Part I — Mon Aug 3, 2026 · The Shore
What’s with the Turtle of Westbrook? Ever heard the name?
David Bushnell farmed in Westbrook until thirty-one, entered Yale in 1771, and there proved gunpowder could explode underwater — inventing the naval mine.
Before the machine, there was the shore. The English called it the Oyster River Quarter when they settled it in 1648 — salt marsh where two small rivers share one mouth into Long Island Sound, oyster beds in the tidal flats, white oak coming off the uplands for ship timber. It was the west parish of old Saybrook then. It wouldn’t be named Westbrook until 1810, and wouldn’t be its own town until 1840. For two centuries it was simply a working coastline: farms behind the marsh, boats in the river, shipyards at the mouth.
On one of those farms, David Bushnell was born in 1740, the eldest son of a farmer with poor land and five children. He worked that farm for nearly thirty years — through his father’s death, through seasons that gave back little — all while reading everything he could get. When he finally sold his share of the farm to his younger brother Ezra, he did something almost unheard of: he entered Yale in 1771, at thirty-one, the oldest student in his class by more than a decade.
At Yale he chased a question most of his professors considered settled: whether gunpowder could explode underwater. The accepted answer was no — water would smother it. Bushnell packed powder into a sealed container, sank it, and touched it off. The detonation was violent beyond anything he expected. He had just invented the underwater mine, and with it a problem: a mine is useless unless something can carry it, unseen, beneath a ship.
He graduated in the summer of 1775, weeks after Lexington and Concord. The colony was at war with the greatest navy on earth, and a forty-year-old farmer’s son from the west parish walked home to the shore carrying the answer in his head.
The farm boy’s question would become the Revolution’s strangest weapon.
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Part II — Wed Aug 5, 2026 · The Machine
A boat designed to sink on purpose. In 1775 that was lunacy. By 1776 it was under a British flagship.
An oak shell with one operator and thirty minutes of air, hand-cranked and carrying a clockwork mine, attacked HMS Eagle on September 6, 1776.
He called it the Turtle — in his own words, two tortoise shells joined together. An egg of oak, taller than a man, the staves shaped like barrel work and bound in iron, the seams payed with tar. One operator sat inside on a bench with about thirty minutes of air. A foot valve let water into the ballast tank to take her down; two brass pumps forced it out to bring her up. Hundreds of pounds of lead hung below for trim — part of it droppable in a heartbeat if everything went wrong. A hand crank drove a paddle propeller, oar-blades working, as Bushnell wrote, upon the principle of the screw. A second, smaller propeller pointed upward to pull her under. On top, a brass crown with glass ports, and above it the weapon: a detachable magazine of gunpowder with a clockwork timer, made to screw fast to an enemy hull.
One problem nearly ended it. No flame could live inside — a candle would eat the operator’s air. Instruments were useless in the dark until Benjamin Franklin’s circle suggested foxfire: bioluminescent fungus from rotting wood, smeared on the compass card and depth gauge needle. It glowed cold and steady — until winter, when the cold killed the light and grounded the boat.
Bushnell’s brother Ezra trained a full year as the operator. Days before the mission, he fell ill with fever. A volunteer stepped in with barely a week of practice: Sgt. Ezra Lee of Old Lyme. On the night of September 6, 1776, Lee cranked across New York Harbor toward HMS Eagle, flagship of the fleet holding the city. He slipped under her, and the drill struck iron. A second try failed. Dawn coming, air gone, Lee released the mine on his retreat — and the East River erupted in a column of water and shattered timber. The Eagle survived. The age of the submarine had begun.
One man, one crank, thirty minutes of air — and every submarine since is his descendant.
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Four centuries of Westbrook, in one place.
Part III — Sat Aug 8, 2026 · The Vanishing
The Turtle survived its famous night. It didn’t survive the month. Its inventor vanished for decades.
The Turtle was lost weeks later, and Bushnell disappeared into Georgia, living out decades as a schoolteacher and doctor called Dr. Bush.
Weeks after the attack on the Eagle, the British caught up with the little machine the only way they could — by sinking the sloop carrying it up the Hudson. Bushnell wrote that he recovered his vessel. If he did, no one ever saw it again. The first combat submarine in history exists today only in letters: no drawing from Bushnell’s hand survives, and every replica in every museum is an educated guess built from words.
Bushnell wasn’t finished. In January 1778 he floated a swarm of his clockwork mines down the Delaware toward the British fleet at Philadelphia — kegs in the ice, drifting with the current. The attack sank little, but the sight of the Royal Navy blazing away at driftwood, barrels, and anything that bobbed delighted the American side so much that Francis Hopkinson — a signer of the Declaration — set it to verse. “The Battle of the Kegs” became one of the most popular satirical ballads of the war, sung in taverns up and down the coast. Bushnell had failed to sink the fleet and succeeded in making it ridiculous, which in a revolution is worth nearly as much.
Washington gave him command of the Army’s Corps of Sappers and Miners — the engineers — and after the war he sailed for France. Then the record simply stops. For years, nothing. When he surfaced again it was in Georgia, teaching school and practicing medicine under the name Dr. Bush. He lived out decades there in plain sight. His neighbors learned who the quiet doctor had been only after he died, when his papers gave him up.
Washington, asked years later about the strange machine of 1776, called it an effort of genius.
The man disappeared. The idea never did — ask Groton, thirty miles up the coast.
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