What caused the sinking of the bismarck?

sabotaged engine-room

Explanation:

They concluded that the direct cause of sinking was scuttling: sabotage of engine-room valves by her crew, as claimed by German survivors. Ballard kept the wreck’s exact location a secret to prevent other divers from taking artefacts from the ship, a practice he considered a form of grave robbing.

b. british workers

the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.