Jumping wire

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German UC-1-class World War I submarine. The wires running up from the bow to the conning tower are the jumping wires

A jumping wire is a

bow and stern of a submarine, via the conning tower or periscope

Its purpose is to allow the submarine to pass under

marine defences, without the obstruction snagging on the vessel's superstructure

, the wire causing the net to ride up and over the top of the submarine.

Jumping wires have fallen out of use since the end of

hydrodynamic drag

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