In the secret underground tunnels of Adolf Hitler "where the Nazis tested new weapons in the last days of the Second World War"

These remarkable images lift the veil on German tunnels long abandoned, which would have led to a secret bunker to test the Nazi weapons.

After exploring miles of underground passages, urban explorer Warren Tepper of Hampshire was shocked by his discovery after crossing a hole in one of the reinforced concrete walls.

It is claimed that the area was a World War II shelter for the Nazis during the bombing of Allied forces and also a bombing system, where ammunition was tested on steel plates.

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Inside, Warren and his co-explorer, Matt, found 4-inch bullet holes in the metal as well as similar holes in the bulletproof glass.

The bunker and surrounding tunnels, located under Duisburg, Germany, could also have been visited by Adolf Hitler and used as a secret meeting place.

Warren said, "At first we did not really see much, it was just a set of empty tunnels, but we then climbed through a hole in the wall to reach another part of the tunnels blocked.

"It was only then that we began to feel how great and incredible the tunnels were," he added.

"As we continued to tour the tunnels, we began to find more and more exciting things. Then we found the ammunition storage and we were really excited at this point, so we continued in the miles of underground tunnels. "

This was followed by a weapons testing room.

Warren said, "It seems like they were firing large caliber guns out there that would have resonated in the tunnels and were extremely noisy.

"I would not have liked to be there when the weapons went down inside," he said. "The very size of the tunnels, the largest I have ever seen."

According to research, Adolf Hitler held secret meetings inside these tunnels, with a particular interest in the technical development of weapons.

"After what I read, the Americans captured bullets in the bulletproof glass.

For Warren and Matt, of Finders Beepers History Seekers, this is one of the most impressive sites they have visited.

Warren published these images on his own YouTube channel, Warren Urbexing, collecting thousands of views in a few days.

Warren said, "To date, it's the largest set of tunnels I've explored, and it was my first abandoned exploration that I did outside of England. .

"It's also the most amazing thing I've done so far because of the weapons testing facilities inside a set of tunnels."

Warren explains some of his favorite parts of the exploration.

"When we entered the test room, I thought it was a furnace where they were heating metal and did not know what to think before seeing the metal pierced with bullets in the piece of metal. solid metal.

He said, "Then everything fell into place and I realized exactly what we were doing and what it was meant for. I was like a kid in a candy store, very excited.

"The bullet impacts in the metal told me that there were big guns in the bunker and that it was scary to think about that in the tunnels.

"The bullets would have flown everywhere through the bounces and the noise in the tunnels must have been horrible for anyone there.

"The holes in the glass were something else; it makes you think of how the soldiers must have felt pulled. Even though it's a bullet proof glass, it's always scary.

"Matt and I think they were Americans who were shooting at the Germans during the war to capture the tunnels, just down the road to the village of Aachen, famous for Americans who fight the Germans. "

This story originally appeared in The Sun.