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State-sponsored surveys have revealed the depths of Beijing’s battle command centre amid continuing tensions with the US.

Buried up to 2,000 metres below the ground, the Central Military China Commission’s Joint Battle Command Centre is said to have space and supplies for one million people.

And the Chinese military refer to it as the “brain” of the People Liberation Army, the world’s largest fighting force.

It is manned 24 hours a day and would provide shelter for President Xi Jinping and his top brass on the dawn of nuclear war.

Geological surveys carried out by the Chinese government have remapped the cave system housing the bunker, and now boast it is the deepest in the world.

(Image: GETTY/CCTV)

State media reports the nuclear command centre has undergone major upgrades in recent years after first being constructed decades ago.

The main entrance is located in the Western Hills National Forest Park, not far from China’s top leaders' HQ near the Forbidden City.

Drinking water has been laid on for around a million people and its capacity is described as that of a “small city”, reports SCMP.

(Image: PLA) (Image: PLA)

Qin Dajun, associate researcher with the Chinese Academy of Sciences’ Institute of Geology and Geophysics, said: "To our knowledge, these are the most deeply buried caves in the world."

He added one of the purposes of the mapping project is to figure out whether or not the base would run out of water.

This is what led to them working out the bunker could have a water supply for more than a million people thanks to underground water sources.

Chinese scientists also boasted nuclear fallout wouldn’t be a problem for water supplies, claiming people could stay in the cave for “years”.

Liu Yong, a nuclear scientist at the University of South China, said: "China has developed cutting-edge technology and equipment for exactly this purpose – it’s among the world’s best.

“They could be stored underground in the cave without causing any harm for many years."

(Image: GETTY)

Chinese president Xi has said he wants his military to be able to win any war as he pours billions of dollars into his army.

Yesterday, China showed off new weapons with a massive military parade and demonstration across 4,000 bases.

China and the US remain at loggerheads over North Korea and the disputed South China Sea.