Firefighters performing a safety drill at one of The Boring Company’s construction sites in Las Vegas received burns from chemicals used in the tunnel excavation process, according to a new report from Fortune .

Those Clark County firefighters weren’t previously made aware of the potential hazard, but were permanently scarred, the report states. Employees working on The Boring Company’s tunnels have also received similar chemical burns.

The Boring Company has been digging tunnels in Las Vegas for a few years in an attempt to connect the entire city with a subterranean network that uses Teslas to shuttle people. It’s the first effort to create a watered-down version of Elon Musk’s dream to build underground transportation, which once included fanciful ideas like hyperloops and larger pe

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