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Titanic enters Iceberg Alley

As Titanic approached her fatal collision, most passengers had gone to bed, and command of the bridge had passed from Second Officer Charles Lightoller to First Officer William Murdoch. Lookouts Frederick Fleet and Reginald Lee were in the crow's nest, 29 metres (95 ft) above the deck. The air temperature had fallen to near freezing, and the ocean was completely calm. Colonel Archibald Gracie, one of the survivors of the disaster, later wrote that "the sea was like glass, so smooth that the stars were clearly reflected." It is now known that such exceptionally calm water is a sign of nearby pack ice.

Although the air was clear, there was no moon, and with the sea so calm, there was nothing to give away the position of the nearby icebergs; had the sea been rougher, waves breaking against the icebergs would have made them more visible. Because of a mix-up at Southampton, the lookouts had no binoculars; however, binoculars reportedly would not have been effective in the darkness, which was total except for starlight and the ship's own lights. The lookouts were nonetheless well aware of the ice hazard, as Lightoller had ordered them and other crew members to "keep a sharp look-out for ice, particularly small ice and growlers".

At 23:30, Fleet and Lee noticed a slight haze on the horizon ahead of them, but did not make anything of it. Some experts now believe that this haze was actually a mirage caused by cold waters meeting warm air – similar to a water mirage in the desert – when Titanic entered Iceberg Alley. This would have resulted in a raised horizon, blinding the lookouts from spotting anything far away.