On our final day in Pittsburgh, we find ourself in a decommissioned coal mine. Just northeast of the city proper, Tour-Ed’s owners run field trips and tours during the warmer months, despite the fact that the mine’s innards run a constant 50 degrees or so, year round.
from Pocket https://techcrunch.com/2019/03/30/cmu-team-develops-a-robot-and-drone-system-for-mine-rescues/
via TV Aerials Leeds
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