DENVER (CBS4) – Crews are working on fixing a big sinkhole that opened in a Denver street after an Uber driver plunged right into it early Friday morning.

(credit: CBS)

It started as a broken water main at 13th and Tennyson Street. The driver told CBS4 he was dropping someone off in the area and couldn’t see the hole.

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“I had no clue it was there at all,” he said. “It was just kind of a shocker for me, it was an unexplainable, just a crazy night tonight.”

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(credit: CBS)

Crews turned off water service for approximately 12 homes. That service was restored by 8 a.m.

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The broken pipe was installed in 1950. Crews believe old age is likely one factor of the break.