US inquiry into Gulf of Mexico oil spill 'blocked by BP supplier National Oilwell Varco'

The White House oil spill commission said that National Oilwell Varco is not cooperating with its requests for information.
The claim came as a Halliburton technician told a Coast Guard panel that he missed data on the upcoming “blow-out” that resulted in the deaths of 11 men aboard the Deepwater Horizon rig because he was taking a 10-minute smoking break.
US officials need National Oilwell Varco help to recreate what the crew who died in the accident might have seen on their monitors in the moments before the he accident on April 20.
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Source: The Telegragh