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Like most machines, they eat fuel.

The early ones were small fast steam engines. Because they burned a liquid fuel and an oxidizer to drive a steam turbine which turned a pair of coaxial mounted counter rotating propellers. But also they had an exhaust which was seen at the surface as a line of bubbles leading right back to the submarine that fired them.

Modern torpedoes mostly run batteries. No bubbles at all.

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Q: What do torpedoes eat?
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