(CNN) A hole was gouged in the deck of Russia's only aircraft carrier, the Admiral Kuznetsov, Tuesday when a crane fell on it while the vessel was undergoing repairs in the northern city of Murmansk, according to Russian state media.

The accident took place after a power supply disruption caused the pumps on the floating dry dock, which was holding the aircraft carrier, to break down, causing the structure to sink.

The dock, known as PD-50, is one of the world's largest floating dry docks and the biggest in Russia, measuring 330 meters long (1,082 feet) and weighing more than 80,000 tons.

Following the disruption, PD-50 quickly became submerged, causing two cranes to fall onto the deck of the Russian vessel, leaving a hole measuring four meters by five meters (13 feet by 16.4 feet), state media Sputnik said.

Russian aircraft carrier, the Admiral Kuznetsov, in an undated photograph from the UK Ministry of Defense.

The aircraft carrier had been exiting the dock when the incident occurred, state media TASS said, and the vessel is sheltering at the 35th Ship Repair Plant.

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