Trongle

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Trongle is a device used on submarines to help swimmers, especially the naval special forces, to locate a submerged submarine in order that they may return to it. The trongle was invented by Captain John Moore of the Royal Navy. [1]

Special forces Military units trained to conduct special operations

Special forces and special operations forces (SOF) are military units trained to conduct special operations. NATO has defined special operations as "military activities conducted by specially designated, organized, trained, and equipped forces, manned with selected personnel, using unconventional tactics, techniques, and modes of employment".

Submarine Watercraft capable of independent operation underwater

A submarine is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. The term most commonly refers to a large, crewed vessel. It is also sometimes used historically or colloquially to refer to remotely operated vehicles and robots, as well as medium-sized or smaller vessels, such as the midget submarine and the wet sub. The noun submarine evolved as a shortened form of submarine boat; by naval tradition, submarines are usually referred to as "boats" rather than as "ships", regardless of their size.

Captain John Evelyn Moore was a submariner in the Royal Navy, a Fellow of the Royal Geographical Society and after retirement from the Royal Navy the author for 15 years of the authoritative naval publication Jane's Fighting Ships.

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