[TangoLimaSierra]

Then what to do think the banging sos sounds are?

Where did you read they were SOS signals? Please share the source.

[Beowulf9]

I heard a reporter say on the radio that there is an old naval signal pattern or something like that to repeat the bangs on the hour and then again on the half hour. This is why he explained it’s thirty minutes apart. But I don’t know who said that. I looked for it on the net and this is all I found:

https://www.msn.com/en-gb/news/world/there-s-hope-trapped-titanic-submarine-victims-desperately-banging-sos-on-doomed-craft-at-3-800m/ar-AA1cQ7EZ