NUCLEAR explosion for CREATE LAKE in USSR

The USSR used a nuclear explosion to create a lake.
Yes, that's true. In the Soviet Union, there was indeed a practice of using underground nuclear explosions for peaceful purposes, and one of the applications was the creation of artificial reservoirs and canals. This was part of a large-scale state program, "Nuclear Explosions for the National Economy" (also known as "Program-7").

Project "Chagan" — The Atomic Lake
When: January 15, 1965.