RUSSIA’S BELOGOROD, A VERY SPECIAL SUBMARINE: “Belgorod won’t work for the navy like other subs but for the GUGI (Main Department of Deep-Water Researches) which works for the intelligence services and is attached to the navy for ship and crew support.” Read the whole thing, especially the part about Poseidon autonomous underwater vehicles that carry nuclear warheads and can travel to enemy coastal cities then detonate underwater and create tidal waves.