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Submarine Doors vs. Submarines

The text on the image reads "Submarine doors were invented in 1578. Submarines in 1577:". Below the text there is an image of a submarine's doorway with an open view of the ocean through it. The opening is framed by green metal, and wooden-like rectangles seem to act as rudimentary locks. A blue rectangle with yellow stripes is at the bottom of the door frame.

Submarine
History
Time
Invention
Technology

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