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A Mark 46 Mod 5 lightweight torpedo.

The torpedo, is an explosive projectile weapon that moves by itself (using a propeller), launched above or below the water surface, that goes underwater toward a target, and made to explode when it hits a target or is near to it. Torpedoes may be launched from submarines, surface ships, helicopters, aircraft, land etc. Robert Whitehead invented the torpedo in 1866.

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