Denver city water workers tried to warn an Uber driver away from a sink hole, but after he drove into the pit anyway, they helped pull him to safety late Thursday night, authorities say.

The Uber driver, who has not been identified, was not injured during the crash that happened minutes before midnight, said Travis Thompson, Denver Water spokesman.

A 12-inch water main burst and ruptured a hole in the pavement near 13th and Tennyson around 11:30 p.m., Thompson said. The roads were already wet from a rain storm and it was a dark residential street. The workers shut a valve that stopped water from shooting into the air, but doing so made the hole harder to see.

Denver water workers were in the process of blocking off the street using vehicles with emergency lights engaged when the Uber driver drove onto the block headed toward the pit.

“This vehicle came in from the back-end,” Thompson said. Emergency workers wearing bright emergency jackets saw the man driving towards the deep pot hole. “They were definitely trying to get the driver’s attention. Crews helped him climb out of the car afterwards.”

Thompson cautioned people to slow down and be more cautious when they see emergency workers because they may have just arrived and haven’t been able to fix a hazardous situation. He also said people should not try to drive through large puddles of standing water.