Dallas Fire-Rescue says it was called to help the Sunnyvale Fire Department with a rescue at the water treatment plant in the 400 block of Long Creek Road Thursday afternoon.
Dallas Fire-Rescue spokesman Jason Evans says the call came in just after 2 p.m.
Contrary to initial reports, the call did not involve a fall, but rather two men were doing pipework in a 10-15 foot hole when they were overcome by fumes and were unable to make it out according to Evans.
Evans says the two men were pulled from the hole at the Dallas City Water Utilities facility, which is owned by the City of Dallas.
Chopper 5 saw CareFlite landing nearby and witnessed rescuers going into a building on the property labeled Transfer Pump Station No. 1.
Just before 3 p.m. a man on a stretcher was brought out of the building and loaded in an ambulance as rescuers administered CPR.
A second man was seen on a stretcher being tended to by rescuers.
Trent Mackey with the Sunnyvale Fire Department said Friday that one man died at Texas Regional Medical Center at Sunnyvale, the other man is being treated at Parkland Hospital, his condition is unknown.