According to the statement of the Russian authorities, the sea part of the operational tests was carried out in two stages.
Noise and magnetic field measurements were made at close distances.
Speed, maneuverability and deep water tests were carried out at long ranges.
The shipyard tested the submarine’s acoustic, radar and communication, power plant and life support systems.
An F-15EX Eagle II assigned to the 40th Flight Test Squadron, 96th Test Wing, out of Eglin Air Force Base, Fla., conducts aerial refueling operations above Northern California, May 14, 2021. The aircraft participated in exercise Northern Edge 21 in Alaska earlier this May. (U.S. Air Force photo by Ethan Wagner)