"Trying to understand how evolution works is one thing that is really interesting about Baikal," Ozersky said. The lake is open to visitors. However, it isn't a great spot for swimming as for five ...

Russian freediver Yekaterina Nekrasova is believed to have set a new world record in under-ice swimming. Russian media reported she swam over 120 meters (400 feet) under the frozen surface of Lake ...