https://www.subtchallenge.com/
Complex underground settings present significant challenges for military and civilian first responders. The hazards vary drastically across domains that can degrade or change over time and are often too high-risk for personnel to enter.
The DARPA Subterranean or “SubT” Challenge seeks novel approaches to rapidly map, navigate, and search underground environments during time-sensitive combat operations or disaster response scenarios.
Seems legit ( ) -- ~$3m prize pool, it seems to have already started but the application page is still open. Open to members of the public; what could go wrong?