Officials on Friday identified a diver who died Thursday on Lake Travis.

Sebastian Medina-Page, 38, of Round Rock, was a project manager and diver who was working underwater to repair a broken pump for a private house, Travis County sheriff's officials said.

Deputies responded to a call at 1:14 p.m. about a diver who had failed to resurface in the Hurst Creek Arm area of Lake Travis, sheriff's officials said. People in the area pulled Medina-Page out, and medics performed CPR on him. Those efforts were unsuccessful, and Medina-Page was pronounced dead.

Investigators are still working to determine the reason he didn't surface, but sheriff's officials said the line that Medina-Page was tethered to was significantly tangled. The investigation is ongoing.