Two friends were hiking in the woods of northern Germany (in an area that was formerly German Democratic Republic territory), when they came across strange, periscope-like pipes protruding from the ground.

They bravely (or foolishly?) decided to explore the area. What they found hidden beneath the ground is a genuine piece of terrifying history.

The friends used to play there as kids but were never allowed to explore the pipes.
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But they finally decided it was time. The entrance was covered with a wooden lid, but they were able to remove it with a crowbar.
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The view from inside the entrance.
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They walked endless, hospital-like hallways…
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The acoustics inside of the bunker made for an even more haunting feeling.
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There were junctions like this one everywhere. They decided not to turn down just one so they won’t end up lost.
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The first dead end.
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And another, caved in and covered in graffiti. They were not the first ones to visit here.
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The path kept going on and turning.
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Although they were scared, they decided not to turn back yet.
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Although it was tempting to get out of there. The graffiti on the left translates to “help!”
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Doors that resemble bank vault doors looked like they were torn from their hinges by force.
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They were heavy and covered in writing that was hard to decipher.
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An arrow, pointing to an exit.
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Pipes on the ceiling, possibly connected to the periscope pipes outside.
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As they went further, the bunker was more and more decayed.
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A series of heavy vault doors any visitor would have to pass to get through.
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“Hello, Satan, I love you.”
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The corridors smelled of sewage.
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Going even further, the corridors were not holding up so well.
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Some of the hallways and rooms were flooded.
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So creepy.
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This pile of trash, in the dark, resembled a sitting man. They both panicked when they saw it!
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Another impassable corridor.
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The “great hall,” the biggest room they discovered.
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In the middle of it was a strange machine.
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Someone’s gloves, left in the great hall.
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Someone must have left in a hurry if they forgot their shoe.
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A sign on the floor says “stay back”
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A massive hatch.
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A mineral growth on the ceilings.
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Source: Imgur

Their camera died right after this last shot. They left the bunker, completely spooked.

I have to admit I would never have gone to investigate something like this if I found it in the woods. Would you?