Exactly, Anon.
Every submarine in the world would have picked this up.
For [17] seconds on 11/11.
The "shot" was focused on the Mozambique Channel, the [C]omoros [A]rchipelago, and in specific–Mayotte Island: which has the appearance of the letter [J].
The channel and the archipelago is a hot spot for Human Trafficking and in specific, Mayotte is a territory of France and a hot spot also for illegal immigration into Europe.
https://www.state.gov/j/tip/rls/tiprpt/countries/2017/271167.htm
https://en.wikipedia.org/wiki/Comoros
https://www.latlong.net/place/mayotte-2150.html