The crews of the Ka-27M and Ka-27PL of the Northern Fleet of Russia conducted exercises to detect and destroy a "submarine" of a mock enemy in the Kola Bay. The helicopters used anti-submarine aerial bombs in the waters of the Kola Bay. During the week, the pilots worked several flight shifts. The total number of flight hours of the crews was more than 20. The Russian Ka-27 helicopter is designed to detect, track and destroy submarines moving at a depth of up to 500 m at a speed of up to 75 km / h in search areas located up to 200 km from the base, with sea waves up to 5 points.