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How Long Could Military Submarines Stay Underwater Then Versus Now?

Summary by grunge.com
In 1775, the world's first naval sub could stay underwater for 30 minutes. Today, they can stay underwater for months at a time, and the record is 140 days.

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How Long Could Military Submarines Stay Underwater Then Versus Now?

In 1775, the world's first naval sub could stay underwater for 30 minutes. Today, they can stay underwater for months at a time, and the record is 140 days.

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grunge.com broke the news in on Friday, July 11, 2025.
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