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Last Updated: Tuesday July 29 2008 13:29 GMT

Was this the deepest dive ever?

The Mir-2 mini-submarine being lowered into Russia's Lake Baikal

Russian scientists say they've set a new record by diving to the bottom of one of the deepest lakes in the world.

Two mini-submarines travelled 1,680-metres to reach the bottom of Russia's Lake Baikal in Siberia, which holds one fifth of the world's fresh water.

The team is waiting for confirmation that they've set a new world record for the deepest dive in fresh water.

Scientists are working in the lake on a two-year mission to find out more about the lake's underwater world.

The Mir I and Mir II mini-submarines which touched the bottom of the lake are already in the record books for reaching depths of more than 4,000m on a separate expedition.