TERRIFYING footage captured the moment an explorer stumbled across a hidden underground bunker.

While wandering around the outskirts of an abandoned chemical lab, the inquisitive adventure discovered a series of tunnels leading to a safe house.

The bizarre collection of underground rooms has been totally abandoned and along with it various items of clothing and supplies.

But the place was also fully stocked with gas masks, a chilling indication that the underground maze had been created to protect against a devastating attack.

In a caption alongside the clip, the man says: This bunker was semi-converted into storage space for old equipment and materials of the chemical laboratory above.

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Getting into the tunnel wast easy as I had to sneak past cameras, but the tunnel was in a remote part of the building.

The eerie five-minute clip posted to YouTube ends with the man sitting down in one of the blacked out rooms with only his torch light to guide him back to safety.

The man explores various abandoned and uninhabited buildings for his YouTube channel, shiey.

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He previously discovered an abandoned building near a factory similarly stocked with medical supplies and gas masks.

Viewers have been stunned by the creepy footage, with one saying: You found three safe houses all filled with gas masks. I think WW3 is near.

Another person said: Props to you man, I would have fainted from fear before I got to the first room.

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'WW3 is near' Chilling moment explorer discovers terrifying safe house under chemical lab - Daily Star