At 06.55 hours on 21 July 1941, M-94 (SrLt Nikolay V. D’yakov) was hit by one torpedo from U-140 and sank, while the U-boat attacked a second submarine at 07.06 hours with another torpedo, but missed. The second submarine was M-98 which rescued the commander and two survivors with a rubber dingy shortly afterwards. They had been on the conning tower when the torpedo hit and thought that the men inside were dead, but the submarine sank in shallow waters lying on its stern at an angle of 60°. This made it possible for eight men to leave through the main hatch and were brought ashore by a launch.