I still remember early in Q when this was a subject the shills would quickly try and take out. It's one of the few subjects nobody "solved" as far as I can tell. Whatever secrets the arctic hold or the many booms people back then heard when it was in play - remains a mystery.
17 seconds in on video…… https://www.washingtonexaminer.com/policy/defense-national-security/u-s-wary-of-chinese-military-threat-in-the-arctic