sentences:  A 20-berth auxiliary accommodation compartment was included in the design for the transportation of soldiers, illegal fishermen, or unauthorized arrivals; in the latter two cases, the compartment could be secured from the outside.However, a malfunction in the sewerage treatment facilities aboard in August 2006 pumped hydrogen sulfide and carbon monoxide into the compartment, non-fatally poisoning four sailors working inside, after which use of the compartment for accommodation was banned across the class.