as both she and the cameraman had recently done a piece on the north sea oil rigs they were both fully up-to-date with their dunker training ( underwater escape training from a helicopter simulator ) , they had to be before they had been allowed to fly out to the rigs , and they would also be spending several hours with tug and muddy , the two crewies , in the back of 411 before it got ranged , going through what they could and could not do .