The stone-walled passages are up to three metres high and were built to withstand cannon fire and other attacks common in ...

The US has had a military presence in Greenland since World War II. But an abandoned underground military site poses a major environmental threat as the planet warms. Researchers found thousands ...

and electricity—effectively trapping enemy forces inside the underground facilities. The militaries deployed robodogs, mine-clearing robots, and "state-of-the-art military technology" in the ...

Ternivka, at the heart of Ukraine’s massive coal mining basin in western Donbas ... Before the war, women were prohibited from working underground in Ukrainian mines under a law going back ...