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When the fourth officer entered the post office on G deck, the mail clerks were hastily pulling armfuls of envelopes out of the sorting racks. On looking down into the lower storage room, he saw mailbags floating in water. When Boxhall reported this to the bridge, the captain gave the order for the lifeboats to be uncovered and went below to see the damage for himself. The ship’s designer, Thomas Andrews, was already making his own inspection tour of the lower decks. He went into the post office and soon dispatched a mail clerk to find the captain. The clerk hurried along the corridor and returned with Captain Smith and Purser McElroy. After they had viewed the damage, Andrews was overheard saying to Smith, “Well, three have gone already, Captain.” Andrews was undoubtedly referring to three of the ship’s bulkheads that divided the ship into the watertight compartments that gave the Titanic its reputation for unsinkability. With only three compartments flooded, however, there was a chance that the pumps could stay ahead of it. The captain then returned to the bridge and gave the order for women and children to go up on deck with lifebelts. Thomas Andrews, meanwhile, continued his inspection. At around twelve-twenty-five William Sloper saw Andrews racing up the staircase with a deeply worried look on his face. As the ship’s designer passed by Dorothy Gibson, she put her hand on his arm and asked him what had happened. Andrews simply brushed past the prettiest girl and continued upward three stairs at a time. He had just discovered that two more watertight compartments had been breached. Andrews knew how serious this was. The bulkhead between the fifth and sixth compartments extended only as high as E deck. As the ship was pulled down at the bow, the water would spill over it into the next compartment, and then the next, until the ship inevitably sank. In all his planning at Harland and Wolff, he had never imagined a scenario such as this. Andrews informed the captain that the ship had only an hour left to live—an hour and a half at best. Smith immediately told Fourth Officer Boxhall to calculate the liner’s position and take it to the Marconi Room so the call for assistance could be sent out. He also gave orders to muster the passengers and crew.
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Hugh Brewster (Gilded Lives, Fatal Voyage: The Titanic's First-Class Passengers and Their World)