victor lyagushkin and a team of divers, who can be seen swimming with a bioluminescent green algae, were the first to begin exploration of blue lake, located near the caucasus mountains in southern russia.
the lake’s sapphire coloured water, which comes exclusively from underwater tributaries, is a result of its high level of hydrogen sulphide. over time, these tributaries have dissolved layers of soluble bedrock, leaving behind the lake and its extensive cave system made of stronger rock. known as a karst lake, blue lake is believed to be the deepest of is kind at 800 feet.
given its location along the ancient silk route, and the uniform cold temperature of its water, the lake is thought to hold many well preserved historic artifacts.
in january of 2012, andrei rodionov, a member of victor’s team, died in a subsequent dive exploring the lake after an equipment failure, while martin robson was placed in intensive care after attempting a technically complex and dangerous nine hour, 209 meter dive.