The Pentagon has confirmed that a new Russian nuclear delivery drone is real. The undersea drone, which carries an enormous nuclear warhead to destroy coastal cities and military bases, was tested late last month. The test was leaked by unnamed sources to The Washington Free Beacon.

Russia calls the system “Ocean Multipurpose System ‘Status-6,” and it is allegedly capable of traveling underwater to distances of to 6,200 miles. It can submerge to depths of 3,280 feet and travel at speeds of up to 56 knots.

The U.S. intelligence agencies estimate Status-6 will carry a multi-megaton thermonuclear bomb payload. For comparisons’ sake the bomb dropped on Hiroshima was 16 kilotons, several orders of magnitude smaller. A one megaton bomb is the equivalent of 1,000 kilotons—one one million tons of TNT. Reports from Russia indicate the bomb could be as large as 100 megatons.

Status-6 is designed to attack enemy coastal cities, ports, shipyards, and naval bases. Once Status-6 arrives at its destination it detonates the bomb, causing an enormous amount of damage through blast and heat. A 100 megaton bomb would generate artificial tsunamis, carrying the destruction far inshore.

As bad as that sounds, it gets even worse. Reports from Russia indicate the bomb could be armed with a “salted bomb”, or one that “salts the Earth” with the dangerous isotope Cobalt-60. Such a bomb could spread such high levels of radioactivity it would prevent anyone from using the attack zone for approximately 100 years. Depending on location and prevailing weather conditions, such an explosion would also carry vast amounts of radiation inland.