The Admiral Kuznetsov, Russia's only aircraft carrier caught fire during maintenance work at Murmansk sea port in the Artic. The fire incident took place on December 12.
According to Russian state news agency, TASS, Six people are thought to have been injured and one person is believed to be missing so far.
Fire broke out in the first power unit and a thick plume of black smoke was seen from the upper deck during the maintenance work. The ablazed area covers 120 square meters (1,292 square feet).
Firefighters are using foam to try to bring it under control as Diesel fuel is currently burning. Specialists working onboard the vessel have been evacuated, TASS reported.
A source with the emergency services told TASS that firefighters cannot reach the source of fire because of heavy smoke from burning cables.
Admiral Kuznetsov is the Russian navy's largest warship and its sole aircraft carrier capable of carrying horizontal take-off and landing aircraft. The warship made its first combat deployment in 2016, in the Mediterranean Sea, when its deck-based fighter jets delivered strikes in Syria.