After claims that a Nazi train filled with gems and gold was buried in a tunnel in Poland, scientists say there is “no evidence” such a train actually exists.

In August, Deputy Culture Minister Piotr Zuchowski said radar images showed a German military train buried during World War II by the Nazis when they were about to be overtaken by Soviet forces in Walbrzych, Poland. But on Tuesday, Professor Janusz Madej from Krakow’s Academy of Mining said a geological survey of the site found no train.

Piotr Koper from Poland and Andreas Richter from Germany told authorities earlier this year that they knew where the train was hidden. The location reportedly was revealed during a deathbed confession. During a news conference on Tuesday, Koper questioned the surveying methods of the Academy and maintained that the train is buried in Poland.

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Write to Eliana Dockterman at eliana.dockterman@time.com.