>>4147463 LB
anyone remember the famous BLOOP. this is what it reminds me of. a mystery never solved… but maybe they were working on some technology back then?
https://www.wired.co.uk/article/bloop-mystery-not-solved-sort-of
https://en.wikipedia.org/wiki/Bloop
https://www.youtube.com/watch?v=OBN56wL35IQ