_Water-tight subdivision._--In the preparation of the design of this vessel it was arranged that the bulkheads and divisions should be so placed that the ship would remain afloat in the event of any two adjoining compartments being flooded and that they should be so built and strengthened that the ship would remain afloat under this condition. The minimum freeboard that the vessel would have in the event of any two compartments being flooded was between 2 feet 6 inches and 3 feet from the deck adjoining the top of the water-tight bulkheads. With this object in view, 15 water-tight bulkheads were arranged in the vessel. The lower part of C bulkhead was doubled and was in the form of a cofferdam. So far as possible the bulkheads were carried up in one plane to their upper sides, but in cases where they had for any reason to be stepped forward or aft, the deck, in way of the step, was made into a water-tight flat, thus completing the water-tightness of the compartment. In addition to this, G deck in the after peak was made a water-tight flat. The orlop deck between bulkheads which formed the top of the tunnel was also water-tight. The orlop deck in the forepeak tank was also a water-tight flat. The electric-machinery compartment was further protected by a structure some distance in from the ship's side, forming six separate water-tight compartments, which were used for the storage of fresh water. Where openings were required for the working of the ship in these water-tight bulkheads they were closed by water-tight sliding doors which could be worked from a position above the top of the water-tight bulkhead, and those doors immediately above the inner bottom were of a special automatic closing pattern, as described below. By this subdivision there were in all 73 compartments, 29 of these being above the inner bottom.