This Diesel generator from the soviet era is comes back to life.

Inside an abandoned bunker, a bunch of engine enthusiasts get to work on an old diesel generator, it was used to power the electrical systems of the facility.

Hidden underground, both intake and exhaust are connected to a large set of pipes, the intake tubing links to an internal network of filtered clean air ducts, while the exhaust goes through the roof, to an outlet at ground level.

This relic of the long gone war times has not run in over ten years, forgotten amidst the intricate passageways of its fortified home.

With excellent image quality, and English subtitles available, the video below is worth watching.