Experts have suggested that the Nazi "Flytrap" — a mysterious structure built during WWII — may have been intended as a launch pad for an experimental 'flying saucer'.

This bizarre structure is informally known as Hitler's Stonehenge and was part of the Project Reise, a clandestine construction operation that involved a deep and intricate network of tunnels built by concentration camp prisoners.

Reise, which is German for 'giant', consisted of seven unfinished underground tunnels built deep into the Sowie Mountains in Nazi-occupied Poland in 1944.

No one knows the true purpose of the structure, because any documents at the time were destroyed by fleeing Nazi forces after their defeat in the war.

This mystery lead to a lot of speculation about its purpose, including from new UKTV Yesterday documentary Secret Nazi Bases.

In a recent episode of the show, forensic archaeologist Robert Sparling says the arched, circular concrete structure by the Nazis may be an indication that they were attempting to build a flying saucer with 'glowing propulsion systems'.

However there were many other theories about the structure, including that it was part of a pioneering helicopter programme, a nuclear project, or a nuclear weapon project.

The more outlandish of the theories suggested that there was some of 'anti-gravity' device being developed there.

However Sparling was relatively confident about this theory, and believed that such a structure may have been able to work and could lift off.

Polish project manager Krzysztof Szpakowski added to the mystery by saying that while he was deep in the tunnels, his phone rang — which should have been impossible.

More than 13000 prisoners from concentration camps worked on building these tunnels, most of them from Auschwitz concentration camps.

These workers were kept in unhygienic conditions, were overworked and starved. This led to two separate typhus outbreaks that killed many of them. In the end, an estimated 5000 people died working on the tunnels.

Because of that, he was convinced that there were electrical impulses being sent by "old futuristic Nazi" technology hidden deep in the tunnel that caused his phone to ring.

These tunnels were also an ideal place to work on Nazi projects as by then the Allies had the upper hand and were decimating the Nazi forces by bombing campaigns.

The tallest parts of the tunnels are 36ft high, which would make them a plausible location for large weapons or machines to be constructed.

Historians seem to agree that whatever the purpose of the tunnels, it had to be something big and crucial.

World War Two expert Patrick Ney said: 'You only have to look at how much concrete was involved to know that this was one of the most important engineering projects that the Nazis were doing.'

Dr Deborah Neill said: 'It stands to reason that some of these tunnels could have been designed as places where they could continue to manufacture even whole airplanes potentially. The sheer scale and size of the tunnels.'

The fact that the Allied aerial forces were so instrumental to their victory lends more weight to theories of Nazi aircrafts.

But whether they were just large planes or flying saucers remains to be seen.

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