Interesting read of a former passenger aboard the missing sub, Titan.
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https://www.npr.org/2023/06/20/1183273102/titan-missing-sub-titanic-rescue-oceangate
https://www.npr.org/2023/06/20/1183273102/titan-missing-sub-titanic-rescue-oceangate
An emergency position-indicating radiobeacon (EPIRB) is a type of emergency locator beacon for commercial and recreational boats, a portable, battery-powered radio transmitter used in emergencies to locate boaters in distress and in need of immediate rescue.