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HOUSTON An accident at a southwest Houston trade school sent two commercial diving students to a hospital in critical condition.

The men were training in underwater construction techniques when they were both discovered unconscious, police said. It wasn t immediately clear how long they were unconscious before others in the class noticed they were in trouble.

The accident happened around 11 a.m. Wednesday at The Ocean Corporation, a private school teaching commercial diving and underwater welding. Company officials wouldn t reveal any specific information about the mishap.

We train commercial divers and non-destructive testers, said Jeff Brown, the school s director of student services. It was part of their training, so the students were being trained at that time. And we re just glad that we have such a good staff here that they were able to take appropriate action.

Amateur video shot shortly after the accident showed paramedics performing CPR on the two students.   One of the victims appeared to be conscious and moving as he was wheeled away.

A pair of Life Flight helicopters carried the two men to Memorial Hermann Hospital.

Police withheld the names of the two injured men pending notification of their families. One of them is 34 years old and the other is 28, police said.

The company has been training students since 1969, but Brown says this is the first time any of its students have suffered such a serious accident.

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