Unidentified Submerged Objects (USO) can be anything from large rocks to creatures and in this case, alien craft.
Credible reports from Russia show Russian nuclear sub commanders and other personnel have been tracking UFO’s that go in and out of the oceans.
They have been tracking these alien craft for DECADES.
They estimate that the craft can easily go from speeds of 0 to 300 mph in the blink of an eye.
These have been documented in the Bermuda Triangle, Sebastopol, Ukraine, Russia’s East Siberian Sea and other areas.
Efforts to stop the craft via dropping depth charges have been unsuccessful.
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https://www.amazon.com/Russias-USO-Secrets-Unidentified-International/dp/1532898401