At least two Russian TV channels broadcast “some secret data” related to a nuclear torpedo, the Kremlin confirms.

NTV and Channel One, two Kremlin-controlled channels, leaked the design by a St Petersburg-based nuclear submarine construction company called Rubin, The Guardian reported. Submarines will fire the nuclear torpedoes, as shown in the design, to create “zones of extensive radioactive contamination making them unsuitable for military or economic activity for a long period”, according to the document shown on the TV channels.

The confirmation also comes from Russian presidential spokesman Dmitry Peskov, who said the classified data had been leaked Tuesday after Russian President Vladimir Putin’s meeting with military officials in Sochi.

“It is true some secret data got into the shot, and it was subsequently deleted,” RT quoted Peskov as saying Wednesday. “We hope that this won’t happen again.”

The nuclear torpedo is reportedly designed to be used against enemy coastal installations. A presentation slide called “Ocean Multipurpose System: Status-6” showed drawings of a nuclear submarine weapons system. The design is done in such a manner that it can bypass any existing missile defense system including NATO radars. The system is also designed to cause significant damage to “important economic facilities” along the enemy’s coastal regions.

Putin earlier said Russia was capable of countering NATO’s U.S.-led missile shield program with the help of its new “strike systems.”

“Over the past three years, companies of the military-industrial complex have created and successfully tested a number of prospective weapons systems that are capable of performing combat missions in a layered missile defense system,” Putin earlier said. “And now we are talking about development of new types of weapons.”