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It is believed the Nazis nicked the famous Amber Room which was built for Russian tsar Peter the Great .

The lavish room was decorated with precious jewels, gold and ambers before it was looted by Hitler’s men in 1941.

Nazi thieves spent their early conquest hoarding art and treasure, and much of it was never found at the end of World War 2.

But the Amber Room has been the subject to countless urban legends and searches as its whereabouts remain a mystery – possibly until now.

Treasure hunters now believe they have found the entrance to a hidden bunker which may contain Hitler’s secret stash near the Polish town of Wegorzewo.

(Image: Mamerki Bunker)

Bartlomiej Plebanczyk, from the Mamerki Bunker museum, said: “We can categorically say we've made a breakthrough in the search.

“Thanks to the use of a professional geo-radar, we were able to determine the location of an underground tunnel.

“After digging up the place indicated by the device, we actually found a hatch, which has almost certainly not been opened since the war.”

It is believed the Nazis hid much of their treasure with intention to later collect it as the Allies bore down on Berlin.

(Image: GETTY)

Plebanczyk added: "Several dozen years have passed since the entrance was buried. At that time, on the original 1.5m x 1.5m plate, which closes the entrance, a tree has grown.

“Until the tree is cut down, there is no physical possibility of opening the entrance.

“The presence of a trunk proves that no one has opened the manhole for the last several decades.”

The site used to be eastern base of the Nazi forces – and was close to infamous Wolf’s Lair, a command post used by Hitler.

(Image: AFP) (Image: AFP)

Treasure hunters need government permission before they can try to break into the bunker.

It is hoped they will be able to either find the Amber Room or put an end of rumours of its presence in Poland.

Nazi thieves stole items from the room at Catherine the Great’s White Palace near St Petersburg – shipping it to Koienigberg Castle.

And as the Nazis faced being overrun by the Red Army, possibly they moved it to this newly uncovered bunker – just two hours away the castle.

(Image: Mamerki Bunker)

The search for the Amber Room has been raging since end of World War 2.

And the Mamerki Museum have also previously marched nearby bunkers for the golden treasure.

Daily Star Online previously revealed a theory that the Amber Room actually went down with the sunken refugee ship the MV Wilhelm Gustloff.

If it is there however it may never be recovered, being buried beneath thousands of tons of crumpled metal beneath the Baltic Sea.