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First responders or... hunter killers.

Seriously though, impressive display by the teams. Someday in the future I will be able to sit outside an abandoned mine drinking coffee while the robots map it all out in 3d.

kinda like the floating orb robots from prometheus.
Wouldn't a miniature drone swarm be more accessible and quicker I wonder? Battery time would be an issue I understand but the mapping would also be quicker, in less than 30 minutes perhaps.
Risk of colliding with stalactites was the problem, as well colliding and communicating with each other. Don't think the tech is there currently.
> This point cloud assembled by Team CSIRO Data61 shows a robotic view of nearly the entire SubT course, with each dot in the cloud representing a point in 3D space measured by a sensor on a robot. Team CSIRO’s point cloud differed from DARPA’s official map by less than 1 percent

https://i.imgur.com/1Mi9YwA.png