Earlier repairs to the waste disposal system had not been completed, which meant that a vital ventilation pipe which ran through the watertight aft bulkhead and the non-return valves were not replaced. It is believed that after a series of freak waves slammed against the ship, the pipe's shell plating burst open and began filling the compartment with seawater. At about 9:30p.m., a muffled explosion was heard and Oceanos lost power. The ship started taking on water, rapidly flooding the engine room.
