Water tanks on the Latvian-flagged ferry Regina Baltica have been cleaned after the potentially deadly Legionella bacteria was found on board.
The 18,300-gt ship (built 1980) is being used to house men working on the Sherringham Shole wind farm off England's east coast.
The workers stopped taking showers and drinking water when the discovery was made.
The ship made an emergency docking at Harwich International Port on Wednesday to tackle the problem.
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