On the subject of decoys, here is an excerpt from the book "The Fleet Submarine in the U.S. Navy" by John D. Alden:
"During the war considerable attention was given to so-called evasion devices that would help submarines escape attack. These consisted of various kinds of noisemakers, false targets, and the like which, when ejected from the submarine, were intended to distract or mislead the antisubmarine forces. A small manually operated signal ejector tube was installed, usually in the overhead of the after torpedo room, for releasing these devices. Later an improved hydraulic operated tube was developed. In peacetime these signal ejectors were used to release emergency radio buoys as well as evasion devices."
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