The sounds of cracking ice over the shallows of Lake Baikal [depth: 5,387 feet (1,642 meters)] https://t.co/6Rf9zgSx26 https://video.twimg.com/ext_tw_video/1835932385218592768/pu/vid/avc1/720x720/DFh8Uh6XvvdP6I45.mp4?tag=12