It was a liner vessel fitted with M.A.N. Engines. Turning gear was giving problems. So it was needed to run the motor by hand with ratchet while engaging worm with wheel. At the time of the incident the ratchet was engaged on the end of the worm shaft. Around the same time the fireman who was cleaning the ER floor pressed the start button while cleaning the switch box resulting in turning of the ratchet along with motor which hit the knee cap of the Engineer, breaking it.