Submerged signal ejector

File:USS Cavalla - Submerged signal ejector.jpg

A submerged signal ejector is a device used by submarines, similar to a torpedo tube. Although, instead of deploying weapons, it launches signal flares, smokes, distress buoys, SEPIRB, water temperature sensors and countermeasure decoys from the submarine.{{cite book|title=C.F. 'O' Class Submarines - Weapons and Equipment|chapter=Sect 5 - Pyrotechnic & countermeasure stores| chapter-url=https://maritime.org/doc/oberon/weapons/part2.htm|url=https://maritime.org/doc/oberon/index.htm|date=c. 1965|author=Royal Canadian Navy}}{{cite web|title=Sonobuoy Based Outdoor Intrusion Detectors|url=http://www.prc68.com/I/Sonobuoy.shtml#Submerged_Signal_Ejector}}{{Cite book|url=https://books.google.com/books?id=iPY4TdHRL8UC&q=Submerged+signal+ejector&pg=PA455|title=My Bloody Efforts: Life as a Rating in the modern Royal Navy|last=MBE|first=Stephen Bridgman|date=2012-09-17|publisher=AuthorHouse|isbn=9781477218020|language=en}}{{cite web|date=2017|title=Notice 34 Information Concerning Submarines|author=Canadian Coast Guard|url=https://www.notmar.gc.ca/publications/annual-annuel/section-f/f34-en.php}} Signal ejectors can also send communication notes, as was done in the rescuing of the BAP Pacocha (SS-48) crew.{{Cite book|url=http://apps.dtic.mil/dtic/tr/fulltext/u2/b132723.pdf|archive-url=https://web.archive.org/web/20170226131859/http://www.dtic.mil/dtic/tr/fulltext/u2/b132723.pdf|url-status=live|archive-date=February 26, 2017|title=The B.A.P. Pacocha Collision: The Escape and Medial Recompression Treatment of Survivors|publisher=Naval Submarine Medical Research Laboratory|year=1989|pages=6}}