 In an attempt to increase the volume of water in Lake Sevan, a 21.6 km tunnel has been constructed to take water from the Vorotan to the lake.Begun during the time in the 1980s, work had to be stopped in 1988, when only 18 km had been completed, because of the armed conflict between Azerbaijan and Armenia over the Nagorno-Karabakh region.The Armenian government finally completed the Vorotan tunnel in 2003, but water has not yet begun to flow into the lake.