Wait. One nuke could completely destroy the West or East coast of the US with a tsunami? Lol. What is he smoking? The Tsar Bomb couldn’t do that.
The nuclear blast wouldn’t come close to wiping out the coasts. But the rumor is they encased the warhead in cobalt, which would produce cobalt-60 contamination over a large area.
Cobalt-60 is what’s used to sterilize medical devices and is quite deadly, even to spore-forming bacteria (which can survive space travel).