the tonkun was still losing containers from her listing deck and one had , to make matters even worse , clipped one of her propeller blades on its way to davey joness locker , causing unacceptable vibrations above anything but slow ahead , and chief engineer jock mcgregors situation was not improving either ; he had been blown off a catwalk in the engine room by the concussion and had landed on top of the huge diesel engine , not only suffering spinal injuries , but severe burns as well .