DEUTSCHNEUDORF , Germany ( CNN ) -- Digging has resumed at a site in the southeastern German town of Deutschneudorf , where treasure hunters believe there are almost 2 tons of Nazi gold and possibly clues to the whereabouts of the legendary Amber Room , a prize taken from a Russian castle during World War II . Treasure hunters use modern technology to try to locate the lost Nazi gold . Heinz Peter Haustein , one of the two treasure hunters and a member of Germany 's parliament , said : `` We have already hit a hollow area under the surface , it 's filled with water and we are not sure if it is the cave we are looking for . '' Digging was stopped more than a week ago amid safety concerns , as authorities and the treasure hunters feared that the shaft might collapse and that the cave -- if it is there -- may be rigged with explosives or poisonous booby traps . At a news conference Friday , Christian Hanisch , the other treasure hunter , said that geological surveying equipment had located a possible cave about 30 feet under the surface containing `` precious metals that can only be either gold or silver . The instruments would not have reacted to any other metal like copper . '' See photos from hunt for lost Nazi gold » . Hanisch pointed out that his father , who was a navigator in the Luftwaffe , the Nazi air force , was one of the troops said to have been involved in hiding art , gold and silver as the Nazis realized that they would lose the war . He said that when his father died , he left coordinates leading to the spot in Deutschneudorf . `` It 's not about getting the reward , '' Hanisch said at the site . `` I just want to know if my father was right and if my instincts were right . '' Haustein , who is paying for the expedition , said he hopes that finding the gold could lead to the Amber Room , whose interior is made completely of amber and gold . It was looted by the Nazis from a castle in St. Petersburg , Russia , after Adolf Hitler 's forces invaded the Soviet Union in 1941 . The room looked so majestic , many called it `` the eighth wonder of the world . '' It disappeared after the war , and today a replica stands in its place in St. Petersburg . Although parts of the Amber Room have resurfaced , the vast majority remains missing . Haustein has been looking for the room for more than 12 years . Watch hunt for Nazi gold at German mountain » . `` I am certain that large parts of the Amber Room are buried somewhere here , '' he said . He said he has collected much circumstantial evidence suggesting that the Nazis hid the Amber Room in old copper mines around Deutschneudorf , but he has no proof . Haustein said the Nazis began bringing valuables including art , gold and silver to the region around Deutschneudorf as early as summer 1944 . Deutschneudorf is in Germany 's Ore Mountains , and the mountain where the treasure hunters claim to have found the Nazi gold was a copper mine until the 19th century . Although the mine was shut down in 1882 , geologists found evidence that soldiers from Hitler 's Wehrmacht -- the German armed forces -- had been there . The machine guns , parts of uniforms and explosives are on display at the town 's museum . Though both treasure hunters say they are certain they will find cultural goods , both admit that they fear disappointment . `` Of course , if you embark on something like this , you ask yourself : 'What if we find nothing again ? What if I was fooled ? ' `` Haustein said . `` But every man has to go his own way , for better or for worse . '' If they do find the treasure , Haustein says , it would legally belong to Germany , although he would recommend that Germany give any Amber Room parts back to Russia . Treasure hunters have typically received rewards of 10 percent of the value of the goods found , but Hanisch says there are no laws dictating the reward amount . E-mail to a friend .
Digging in search of lost Nazi gold resumed on Tuesday . The treasure was found by a German farmer who had been digging for the past two years and is now being sold to an American collector. Men behind mission battle doubts : `` What if we find nothing again ? ''