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Underground galleries, part of Nazi Germany "Riese" construction project are pictured under the Ksiaz castle in the area where the "Nazi gold train" is supposedly hidden underground, on August 28, 2015 in Walbrzych, Poland. Poland's deputy culture minister on Friday said he was 99 percent sure of the existence of the alleged Nazi train that has set off a gold rush in the country. AFP PHOTO / JANEK SKARZYNSKI        (Photo credit should read JANEK SKARZYNSKI/AFP/Getty Images)
Underground galleries, part of Nazi Germany "Riese" construction project are pictured under the Ksiaz castle in the area where the "Nazi gold train" is supposedly hidden underground, on August 28, 2015 in Walbrzych, Poland. Poland's deputy culture minister on Friday said he was 99 percent sure of the existence of the alleged Nazi train that has set off a gold rush in the country. AFP PHOTO / JANEK SKARZYNSKI        (Photo credit should read JANEK SKARZYNSKI/AFP/Getty Images)

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'Nazi gold train' mystery close to being solved?

A year after treasure hunters alerted authorities to an underground 'Nazi gold train', a team started excavations in the hope of solving the WWII mystery.

'Nazi gold train' mystery close to being solved?

A year after treasure hunters alerted authorities to an underground 'Nazi gold train', a team started excavations in the hope of solving the WWII mystery.