WASHINGTON, Nov. 24 (UPI) -- Transocean employees have refused to cooperate with the investigation into the Deepwater Horizon spill, U.S. regulators say.
Transocean owned and operated the oil rig where 11 workers were killed in an explosion in April. BP, which owned the well, spent months struggling to cap the leak as thousands of gallons spewed into the Gulf of Mexico.
The Chemical Safety Board said only one of eight Transocean employees has so far been questioned under oath and three have refused to cooperate, the Houston Chronicle reported. Some are now working outside the United States.
Don Holmstrom, the investigations manager, contrasted the investigation with the one into the explosion at BP's refinery in Texas City in 2005.
"In Texas City, there was some generally good cooperation from the regulator, from BP and from the various contractors," he said.
A source told the Chronicle most of the other companies involved in the investigation have been cooperative.
Brian Kennedy, a Transocean spokesman, said the company has given the board "volumes of information."