Not creepy at all …

The ideal space would be a human-made underground environment spanning several city blocks w/ complex layout & multiple stories, including atriums, tunnels & stairwells. Spaces
that are currently closed off from pedestrians or can be temporarily used for testing are of
interest. pic.twitter.com/GkWKm2w2p9

— DARPA (@DARPA) August 28, 2019