Recently, NEWSREP Editor-in-chief Jack Murphy reported on the U.S. military’s standing plan to infiltrate Iranian underground bunkers housing integral elements of the nation’s nuclear apparatus. If war between the United States and Iran were ever to come to fruition, these facilities (commonly referred to as hardened and deeply buried targets, or HDBTs) would be among America’s top priorities. But taking them out of commission would require a more dramatic approach than America’s preferred method of warfare by ballistic missile.

Many of these HDBTs are constructed deep underground, often by tunneling into mountains. The natural barrier provided by 2,000 feet of rock would, in some cases, render even America’s bunker-busting munitions useless. Instead, infiltrating and destroying these facilities would fall to America’s elite counterterrorism unit, the 1st Special Forces Operational Detachment-Delta, or Delta Force.

Although Delta has been training for these potential underground combat operations in Iran for years, the risks associated with such an operation have grown in tandem with the increasing number of potential enemy states—including North Korea, China, and Russia—all of which maintain (or are rumored to maintain) sizable underground facilities meant to shield against weapons of mass destruction and potentially afford protection to command and control elements from surveillance or engagement.

Soldiers of 2nd Stryker Brigade Combat Team, 2nd Infantry Division, prepare to clear a corridor during subterranean operations training. (U.S. Army)

As Jack Murphy pointed out in his NITRO ZEUS piece, “Numerous countries have sought to conceal and protect vulnerable military resources underground inside facilities hardened with reinforced concrete, vault doors, internal environmental systems, and more, such as the United States has done at the Cheyenne Mountain Complex.”

Put simply, fighting in enclosed spaces deep underground, where communications are limited and the stakes are at their highest, isn’t just a tactical nightmare, it may also become a pervasive part of what nation-level warfare looks like in the 21st century.

It’s likely with this concern in mind that America’s Defense Advanced Research Projects Agency, or DARPA, has issued a request for information regarding advanced technologies and methodologies that can be employed for the “3D mapping and surveying of underground environments.”

“What makes subterranean areas challenging for precision mapping and surveying, such as lack of GPS, constrained passages, dark or dust-filled air, is similar to what inhibits safe and speedy underground operations for our warfighters,” said DARPA Tactical Technology Office (TTO) Program Manager Timothy Chung. “Building an accurate three-dimensional picture is a key enabler to rapidly and remotely exploring and searching subterranean spaces.”

If you’ve seen the film “Prometheus,” this effort may seem familiar. In the movie, crew members deploy floating drones that use lasers to quickly map out the subterranean cave complex they’re exploring.