On December 8, 2016, US intelligence reported that, on November 27, Russia had conducted a test of a nuclear-powered UUV, launched from a B-90 Sarov-class submarine. In February, the Pentagon officially added Status-6 to Russia's nuclear triad by mentioning it in the US Nuclear Posture Review.
At present, the technical specifications of Poseidon torpedoes are classified information. So far, it is known that the UUV is over 19 meters in length and almost two meters in width. Earlier, it was assumed that Poseidon would be equipped with a 100-megaton thermonuclear warhead that could obliterate entire coastal cities and cause destruction further inland, triggering tsunamis laden with radioactive fallout.