Gardiner maintains that on 14 April, First Officer Murdoch (who was not officially on duty yet) was on the bridge because he was one of the few high-ranking officers other than Captain Smith who knew of the plan and was keeping a watch out for the rescue ships. One of Gardiner's most controversial statements is that the "Titanic" did not strike an iceberg, but an IMM rescue ship that was drifting on station with its lights out. Gardiner based this hypothesis on the idea that the supposed iceberg was seen at such a short distance by the lookouts on the "Titanic" because it was actually a darkened ship, and he also does not believe an iceberg could inflict such sustained and serious damage to a steel double-hulled vessel such as the "Titanic".