The five employees reported missing after an Oklahoma rig explosion on Monday are presumed dead, officials said on Tuesday.

Pittsburg County Sheriff Chris Morris said at a news conference that the search for the workers has turned to a recovery mission after the blast in eastern Oklahoma, about 100 miles southeast of Tulsa.

Morris identified the employees as: Josh Ray of Fort Worth, Texas; Matt Smith of McAlester, Oklahoma; Cody Risk of Wellington, Colorado; Parker Waldridge of Crescent, Oklahoma; and Roger Cunningham of Seminole, Oklahoma.

Three of the workers were employed by Houston-based Patterson-UTI Energy Inc. Company president and CEO Andy Hendricks pledged a full investigation into the explosion.

Authorities said the men were at a depth of 13,500 feet drilling to 17,000 feet when the blast took place, FOX 25 News reported.

OKLAHOMA RIG EXPLOSION LEAVES 5 MISSING, EMERGENCY OFFICIAL SAYS

In this photo provided from a frame grab from Tulsa's KOTV/NewsOn6.com, fires burn at an eastern Oklahoma drilling rig near Quinton, Okla., Monday Jan. 22, 2018. Five people are missing after a fiery explosion ripped through a drilling rig, sending plumes of black smoke into the air and leaving a derrick crumpled on the ground, emergency officials said. (Christina Goodvoice, KOTV/NewsOn6.com via AP)

In this photo provided from a frame grab from Tulsa’s KOTV/NewsOn6.com, fires burn at an eastern Oklahoma drilling rig near Quinton, Okla., Monday Jan. 22, 2018.

 (Christina Goodvoice, KOTV/NewsOn6.com via AP)

Sixteen people who were on the site at the time of the blast escaped without major injuries. One person was airlifted to a hospital for treatment.

The explosion sparked several fires and sent thick black smoke into the air. The derrick, a towering metal structure above the well, also collapsed.

Fox News’ Katherine Lam, Matt Richardson and The Associated Press contributed to this report. 

Travis Fedschun is a reporter for FoxNews.com. Follow him on Twitter @travfed

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