What is "kanyon"

The Kanyon is a purported nuclear-powered and nuclear-armed unmanned underwater vehicle developed or being developed by Russia. It would supposedly be able to deliver a nuclear weapon of up to 10 megatonnes against Western naval ports and coastal cities. "Kanyon" is the name given this drone by the Central Intelligence Agency.

The first public report about the Kanyon was in September 2015 and cited Pentagon sources. On November 10, the government-aligned television station NTV "accidentally" showed a document in the hand of a Russian general during a report in which Russian President Vladimir Putin denounced American plans concerning defensive missiles. There was debate afterwards about whether this was a warning to the West or disinformation.