One man is dead and his father has been transported to a local hospital following an incident while the two were working inside a confined space at a Port Arthur facility Friday morning.

The Port Arthur Fire Department received the call about 10 a.m. that two men who were working inside an 18-wheeler tanker had been found incapacitated inside the tank according to Port Arthur Fire Chief Larry Richard.

The men, a father and son, had not been seen for an extended period and were discovered when another employee at Free Flow Services went to check on them according to Port Arthur Police Department Deputy Chief Raymond Clark.

Firefighters found the father conscious and were able to make an immediate entry and get him out of the tank Richard said.

The father was transported to the Medical Center of Southeast Texas.

Conditions inside the tank made entry for the rescue team impossible until the air was cleared and the small opening in the tank also made entry and rescue difficult according to Richard.

The son was pulled out of the tank next and transported to the Medical Center of Southeast Texas by about 12:45 p.m. and was later pronounced dead.

The cause of death is currently under investigation.

Free Flow Services, in the 1000 block of Highway 365 in Port Arthur, specializes "industrial container cleaning" including frac tanks, roll off boxes, tanker cleaning and preparation, tanker internal stain removal, and other industrial cleaning services.

This is a developing story. Check back for updates.