A submarine is a special kind of ship that can travel underwater for long periods, often used for research, exploration, or military purposes.
From Latin 'sub' meaning 'under' and 'marinus' meaning 'of the sea'. The word originally meant 'under the sea' and was later used as a noun for the underwater vessel.
A submarine is basically a controlled metal bubble that balances its weight with water so it can sink or rise on command. It’s one of the few human vehicles that moves in three full dimensions: forward–back, side–side, and up–down.
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