. Last Updated: 07/27/2016

Siberian Swim Set

BIYSK, Western Siberia () -- Ten Russians began a marathon swim down a chilly Siberian river to mark the 300th anniversary of the founding of the Russian navy and the centenary of the modern Olympic games.

The swimmers are scheduled to cover a 270-kilometer stretch of the mighty Ob river in two days, starting in the town of Biysk and swimming north to Barnaul, capital of the Altai region.

The temperature of the Ob at this time of year does not exceed 11 degrees Celsius, Itar-Tass reported. Swimmers are not permitted to use flippers, use salve to protect their bodies from the cold, or use stimulants, the agency said.