A multi-agency search operation is currently underway following the report of a concern for welfare of a man in Brothers Water.
Cumbria police was called at 6.55pm yesterday by the North West Ambulance Service to the area after a man in his 30s went into the water for a swim.
Cumbria Fire and Rescue, mountain rescue, Coastguard and North West Police Underwater search team have been assisting in the search.