"This method inflicts much more damage," said Valery Kulbitsky, the torpedo's chief designer, according to the report. "When it enters the magnetic field of a ship or boat, an electromagnetic fuse is triggered." It only works at a certain distance, so it does not always hit the body. The combat version of the torpedo contains more than 300kg of Russia's most modern explosives. A single or two torpedo hits are enough to destroy a destroyer-class ship.