Below is an excerpt from the article.
The Defense Advanced Research Projects Agency (DARPA), the Pentagon’s cutting-edge research and development branch, is funding one of the oddest robotic concepts yet: a robot that mimics an earthworm to dig underground tunnels. It’s all part of an effort to demonstrate robotic tunneling technologies that will provide a secure way of resupplying U.S. Army troops in battle zones.
https://www.popularmechanics.com/military/weapons/a32700671/tactical-tunnel-earthworm-robot/
The Children Under the Getty Museum 