Subt: Subterranean drone mapping startup Emesent raises $2.5M to autonomously delve the deep

Seemingly every industry is finding ways to use drones in some way or another, but deep underground it's a different story. In the confines of a mine or pipeline, with no GPS and little or no light, off-the-shelf drones are helpless - but an Australian startup called Emesent is giving them the spatial awareness and intelligence to navigate and map those spaces autonomously.