Apparently the ice is about 1 metre thick
www.youtube.com/watch?v=Iv7n6QEIHIw
( , Mon 15 Feb 2021, 22:16, Share, Reply)
www.youtube.com/watch?v=Iv7n6QEIHIw
( , Mon 15 Feb 2021, 22:16, Share, Reply)
According to the YT comments, the audio on the video was nicked from here:
soundcloud.com/andreas-bick/dispersion-in-ice-sheet
Actually recorded with a hydrophone under ice on a lake near Berlin.
( , Wed 17 Feb 2021, 0:54, Share, Reply)