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How deep did Cornelis Drebbel’s submarine travel during its trials?

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USS Nautilus — submarine The former USS *Nautilus*, launched in 1954, being towed to Groton, Connecticut, to become a museum, May 1985.

During his trials between 1620 and 1624, Cornelis Drebbel’s submarine successfully traveled at depths ranging from 12 to 15 feet (approximately 4 to 5 metres) beneath the surface of the River Thames.12