11 Predictions from Leonardo Da Vinci That Actually Came True

Submarines

The inventor also had the idea of ships that could travel underwater, and even sketched designs for this type of vessel that could be submerged.

Realizing how dangerous this could be in the wrong hands (because such a ship could be used to covertly sink another ship), da Vinci kept his primitive submarine designs a secret “because of the evil nature of men who practice assassination at the bottom of the sea.”

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