And dont forget there is a missing Russian sub

I think we saw them pop up | not sure if they are. not confirmed same subs | Russian Navy Submarines Surface In Artic
Flag Russia The Russian Navy's ICEEX, ' Umka-21 ', is taking place in the Arctic. As part of the exercises, three ballistic missile submarines (SSBNs) surfaced in close proximity to each other. The two DELTA-IVs and a single Borei-II ( K-549 Knyaz Vladimir) were within 300m. They surfaced in pre-marked locations.

According the the Russian MoD press reports a nuclear submarine used a torpedo to create a hole to surface through. It is unclear which boat, and it is unlikely to be any of the positions shown above. (marker sticks are visible in the video, before the submarine surfaces). The ice depth is around 1.5 meters.