“ The cause of the longshoreman's injury was carbon monoxide inhalation that occurred as he and other longshoremen were using gasoline-powered vehicles to move cargo in the ship's lower hold. The shipowner contends that the stevedore's hatch boss acted unreasonably. When longshoremen complained about the lack of ventilation in the hold, the hatch boss informed one of the ship's officers that his men would walk off the job unless the officer turned on the ship's ventilating system. ”

“ The officer told the men to continue working and promised to activate the ventilating system, which was within the shipowner's exclusive control and which was concededly adequate to ventilate the hold. ”