I did have the opportunity to visit the DDII (drilling the second relief well) back in June when I was there with the USCG. To tell the truth, I wasn't looking for knives, but spark hazards didn't seem to be a concern. There is plenty of heavy equipment being operated and drill pipe, etc. being moved around and assembled or disassembled.

Of course, conditions undoubtedly change when they hit the oil reserve.