K-126 incident

The K-126 incident was an incident involving Soviet submarine K-126 and the Realmarine in April 1975.

spotted a foreign vessel off Carrington headed east. The navy sent out a patrol boat (R.S. Swantown) to investigate. Heading in the general direction of the ship (near Drenthe) the Swantown discovered a surfaced Echo-class Soviet submarine.

The K-126 signaled to the Swantown that they were having reactor issues and requested that a larger vessel be sent to assist the submarine. Swantown contacted navy headquarters and they prepared to send a ship, but the K-126 suddenly signaled they were having "major issues" and the sub went down, apparently having flooded and sank.