When one of the largest California wildfires on record broke out in 2013, raging for more than two months and threatening San Francisco's water supply coming from Yosemite, firefighters used drones to get aerial shots of the blaze and determine the best points of entry. Now those drones have come down from the mountains and into the city.
In Los Angeles the city's firefighters and sewer managers are using drones to perform dangerous work.
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