In boiler room No. 4, at around 01:20, water began flooding in from below, possibly indicating that the bottom of the ship had also been holed by the iceberg. The flow of water soon overwhelmed the pumps and forced the firemen and trimmers to evacuate the forward boiler rooms. Further aft, Chief Engineer Bell, his engineering colleagues, and a handful of volunteer firemen and greasers stayed behind in the unflooded No. 1, 2 and 3 boiler rooms and in the turbine and reciprocating engine rooms. They continued working on the boilers and the electrical generators in order to keep the ship's lights and pumps operable and to power the radio so that distress signals could be sent. According to popular belief, they remained at their posts until the very end, thus ensuring that "Titanic"s electrics functioned until the final minutes of the sinking, and died in the bowels of the ship. According to Greaser Frederick Scott at the British inquiry, when it became obvious that nothing more could be done, and the flooding was too severe for the pumps to cope, they came up onto "Titanic"s open well deck, but by this time all the lifeboats had left. Scott testified to seeing the engineers gathered at the aft end of the starboard Boat Deck. None of the ship's 35 engineers and electricians survived. Neither did any of the "Titanic"s five postal clerks, who were last seen struggling to save the mail bags they had rescued from the flooded mail room. They were caught by the rising water somewhere on D deck.