US Marine Corps engineers completed the construction of an underground defense system during a recent field exercise in North Carolina.
The exercise was held to gauge the effectiveness of subterranean defensive positions for future warfare.
The chevron-shaped underground system was covered by soil at ground level to camouflage bunkers for soldiers to avoid detection.
“We’re conducting a three-bunker subterranean system interconnected with culvert piping,” engineer equipment officer Dario Ramirez said. “These materials can be found anywhere around the world, and that’s why the company commander decided to choose these materials.”
Previously, the US Marines only performed shallow excavation, installing shelters at ground level and covering them with camouflage netting to avoid detection.
However, these shelters are noticeable by drone cameras.