The “Battle mole" project was more classified than even the Soviet nuclear project, and details about it remain sketchy. What is known, however, is that Nikita Khrushchev, who led the USSR through much of the ‘Cold War,’ actively supported the project.
That a secret underground plant for production of subterrines was built in Ukraine is also known. And, in 1964, the first Soviet subterrine nuclear reactor, dubbed "Battle mole" was unveiled.
Little information is available about this reactor except that the subterrine had a stretched titanium cylindrical body with a pointed end and a powerful drill. According to sources, the size of the atomic subterrine ranged between three and almost four metres in diameter and 25 and 35 meters in length. The speed at which it could move underground was between 7 kms / hour and 15 kms / hour.
Also, available data indicates that the nuclear physicist Andrei Sakharov was involved with the creation of this machine, possibly with development of the original soil crushing and propulsion system technology. The ‘cavitation’ flow created around the battle mole’s body reduced friction and enabled it to bore through granite and basalt.
The crew of the "Battle mole" consisted of five people. The machine could additionally carry up to 15 paratroopers and about a ton of cargo; explosives or weaponry. These combat vehicles were designed to destroy fortifications, underground bunkers, command posts and missile launchers located inside mines. The "Battle moles" were prepared to carry out a special mission.
According to the Soviet Union’s military command, the plan was that if relations with the United States deteriorated beyond a point, the subterrines could be used for an underground strike on America.
The “Battle moles" would be brought on submarines to the coastal waters of the seismically unstable California to drill underground inside the USA and install underground nuclear charges in areas where American strategic facilities were located.
The activation of the nuclear mines in the region would provoke powerful earthquakes and tsunamis, all of which would be considered natural disasters.
According to some reports, test runs of the Soviet nuclear subterrine were carried out in different geological conditions; in suburban Moscow’s soils, in the Rostov region and in the Urals. Witnesses who observed the tests were most struck by the capabilities the subterrine demonstrated in the Ural mountains. The "battle mole" easily bit into hard rock and destroyed the underground target.
However, a tragedy occurred during the repeated trials. For reasons unknown, the machine exploded deep within the bowels of the Urals, killing the entire crew. Shortly thereafter, the project was shelved.