apr 9, 1620 - Cornelis Drebbel

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Cornelius Drebbel, who was employed by the British King James I. the Drebbel sub was probably a modified rowboat coated in greased leather and manned by a team of oarsmen. Sometime around 1620, he used it to dive 15 feet beneath the River Thames during a demonstration witnessed by King James and thousands of astonished Londoners

(https://www.history.com/news/9-groundbreaking-early-submarines)

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