Vladimir Putin's huge 640ft Belgorod submarine has set sail.
The large vessel, able to sink aircraft carriers and dubbed the 'city killer' has sailed out on open waters for the first time.
It's believed the Belgorod is the largest submarine to be built over the past 30 years.
It was put to sea for the first time this week, as Russia flexed its naval muscles, following the incident with the British destroyer HMS Defender in the Black Sea.
Warning shots and bombs were deployed near the Royal Navy ship after Russia claimed it was in their waters.
Experts fear the 79-ft long torpedoes, dubbed Poseidon, could be detonated underwater to cause a radioactive tsunami.
The devastating impact would threaten coastal cities with waves of up to 300ft high.
The humungous vessel is reportedly operated on behalf of the nation's secretive Main Directorate of Undersea Research.
It's understood to be central to Russia's intelligence-gathering operation.
Reports also claim the sub is equipped with six nuclear-armed torpedoes, each able to carry warheads with an explosive power of two megatons.
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It's equivalent to two million tons of TNT, or 130 times more powerful than the Hiroshima bomb.
Dr Sidharth Kaushal, of the Royal United Services Institute, said the fleet of UUVs could be valuable for President Putin.
He told the Mail Online: "The Belgorod is large enough to act as a mother ship for a unique set of smaller vessels which have deep-diving capabilities and the ability to tamper with undersea infrastructure.
"It's well equipped for sabotage and clandestine operations. Its Poseidon nuclear torpedoes could also be a very effective means of attacking an aircraft carrier in wartime – one against which at present no defence exists.
"The Belgorod will not be part of the Russian Navy per se, meaning its covert and aggressive actions will effectively be deniable.
"The submarine appears set up for non-attributable Special Forces warfare with its commanders answering directly to the [political] leadership and bypassing the Russian naval command structure."
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It comes after the HMS Destroyer was issued 'warning shots' by Russian navy ships on Wednesday.
The dramatic scenes saw reported bombs deployed near the vessel as a warning as it passed into disputed waters.
Sergei Ryabkob, Russian Deputy Foreign Minister warned the country will defend its borders using "all possible means".
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