DENVER -- Crews worked on fixing a big sinkhole that opened in a Denver street after an Uber driver plunged right into it early Friday morning, CBS Denver reports.

It started as a broken water main around 11:30 p.m. The driver told CBS Denver he was dropping someone off in the area and couldn't see the hole.

"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."

Workers attempt to contain a sinkhole in Denver. CBS Denver

Denver city water workers arrived to the scene around midnight to try to close off the area. Workers said they tried and failed to warn the driver before his car was swallowed by the sinkhole around 12:45 a.m.