Winter, ice seals in the open hole in the bite to breathe, as the seals are generally live in seawater, it was once believed to Lake Baikal by an underground tunnel connected with the Atlantic Ocean.

• 冬季时，海豹在冰中咬开洞口来呼吸，由于海豹一般是生活在海水中的，人们曾认为贝加尔湖由一条地下隧道与大西洋相连。