An anechoic room simulates a free field — a representation of a theoretical infinitespace, in which there are no sound wave reflections (echoes). In rooms such as these, the only sounds which exist are emitted directly from their source, and not reflected from another part of the chamber. Anechoic rooms have the characteristic of being muted, muffled, and silent.
An anechoic room is used for making acoustic measurements with microphones and loudspeakers.
On modern military submarines the outer hull is covered with a thick layer of special sound-absorbing rubber, or anechoic plating, to make the submarine quieter.
In many early classes of submarines (see history), the Control Room, or "Conn", was located inside this tower, which was known as the "conning tower".
The pressure hull is generally constructed of thick high-strength steel with a complex structure and high strength reserve, and is separated with watertight bulkheads into several compartments.
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