Recently, declassified documents contain many cases of possible USO encounters in Soviet era has been published in public. According to Vladimir Azhazha, former naval officer and Russian UFO researcher, one of the most interesting cases he examined involved a nuclear submarine on a combat mission in the Southern Pacific. During the routine operation, the submarine detected 6 unknown objects travelling in formation at speeds in excess of 230 knots (265+ mph). In comparison, the fastest submarine was the Soviet K-222, which only reached about 44 knots (51 mph). Vladimir Azhazha believes the issue should be thoroughly investigated. The submarine’s sonar determined the objects were heading straight for it so the captain gave the order to surface. The USOs followed them to the surface then flew away.
Similar instances have been reported in the region of the Bermuda Triangle, as retired submarine commander Yuri Beketov recalls. "On several occasions the instruments gave reading of material objects moving at incredible speed. Calculations showed speeds of about 230 knots, or 265 mph. Speeding so fast is a challenge even on the surface. But water resistance is much higher. It was like the objects defied the laws of physics. There’s only one explanation: the creatures who built them far surpass us in development,” said Beketov.