- Treasure hunters Piotr Koper and Andreas Richter claimed Nazi gold train was buried nine metres down in an old railway tunnel in Walbrzych, Poland
- Pair said train was packed with £250 million of gold, jewels gems and art
- Legend had it the train was buried by the retreating German army in 1945
- Scientists who dug site said a tunnel exists – but no there is no train inside
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