The formal investigation into the accident by the US National Transport Safety Board (NTSB) has now been produced and we publish here extracts from the report. Overall, the NTSB determined that the probable cause of the boiler rupture was deficient boiler operation, maintenance, and inspection practices of NCL (the owner), which allowed material deterioration and fatigue cracking to weaken the boiler, while inadequate surveys by classification society Bureau Veritas (BV) contributed to the cause.
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