Secret Nazi 'weapons of mass destruction factory' discovered underground in Austria

A new secret Nazi weapons factory, where a nuclear bomb may have been developed, has been recently found underground in Austria.

The 75-acre facility, located near the town of St Georgen an der Gusen, was believed to have been used to create and test weapons of mass destruction, the Mirror reported.

It was deemed so important to the Nazis that the head of the SS and Hitler's right hand man Heinrich Himmler, even oversaw its development.

The complex, which experts believe was the "biggest secret weapons production facility of the Third Reich," was discovered by Andreas Sulzer, an Austrian documentary maker who found reference to the bunkers in the diaries of an old Austrian physicist.

They were so well hidden though that bulldozing equipment was to needed to cut away massive granite plates the Nazis had used to hide the entrance shaft in 1945. Ground penetrating radar was also required to confirm reports of how large the facility was.