The quest to find a fabled "Nazi Gold Train" from World War II has been given a boost as searchers have been granted permission to conduct a "noninvasive" examination of a site in southwestern Poland.

Two treasure hunters claimed to have found the train in August. A group including the two men will likely begin searching the site early next week, local authorities say, AFP reports. 

A second group from the Mining Academy in Krakow will also work the site, Walbrzych municipal spokesman Arkadiusz Grudzien said.

"The experts will be able to use different measuring equipment and detectors but are not allowed to touch the ground," Grudzien told AFP.

"They won't be able to dig or drill or introduce cameras into the ground. They're only allowed to perform a non-invasive search."

According to the legend, the Nazi train was loaded up in the German city of Breslau, which is now a part of Poland called Wroclaw. The train supposedly entered a tunnel near a cliff-top medieval castle and never emerged, as the Soviet army approached on May 8, 1945, halting its progress.

The two treasure hunters, Piotr Koper of Poland and Andreas Richter of Germany, announced in August that they had discovered a 320-foot-long train carriage buried underground in a railway tunnel in southwestern Poland, AFP reports.

Poland's Deputy Culture Minister Piotr Zuchowski said in August he was "more than 99 percent sure" the train existed, citing ground-penetrating radar images, AFP reports.

Officials have since cast doubt on that claim.

Reports indicate that any excavation of the site would require extreme caution, as it could be rigged with mines or other explosives.

Related Stories:

• More Hidden Tunnels Found Near Nazi Gold Train
• Report: Putin Could Seize Nazi Gold Train for Alleged Soviet Reparations