Mystery of Hitler’s secret tunnel labyrinth in Poland where 5,000 workers died… and no one knows why it was built

A SECRET underground Nazi complex that was never completed remains a mystery as no one knows for certain why Adolf Hitler’s genocidal regime built it.

The Third Reich began to build a gigantic subterranean bunker with Jewish slave labour in what was then Germany at the end of WW2 – known as Project Riese.

AlamyThe entrance to the secret Nazi underground tunnels in Poland[/caption] AlamyThe tunnels were built at the end of the war but abandoned as the Soviets advanced[/caption]...