on 8 April when a warning of an Indian Ocean raid by the Japanese fleet was received, and she sailed that day for the Maldives with no aircraft on board. On 9 April a Japanese scout plane spotted her near Batticaloa, and she was attacked by several dozen dive bombers shortly afterwards. With no air cover, the carrier was quickly sunk by the Japanese aircraft. Most of the survivors were rescued by a nearby hospital ship, although 307 men from Hermes were lost in the sinking. Development Like Hōshō, Hermes was based on a cruiser-type hull and she was initially designed to carry both wheeled aircraft and seaplanes. The ship's design was derived from a 1916 seaplane carrier design by Gerard Holmes and Sir John Biles, but was considerably enlarged by Sir Eustace d'Eyncourt, the Director of Naval Construction (DNC), in his April 1917 sketch design. Her most notable feature was the seaplane slipway that comprised three sections. The seaplanes would taxi onto the rigid submerged portion aft and dock with a trolley that would carry the aircraft into the hangar. A flexible submerged portion separated the rear section from the rigid forward portion of the slipway to prevent the submerged part from rolling with the ship's motion. The entire slipway could be retracted into the ship, and a gantry crane ran the length of the slipway to help recover the seaplanes. The design showed two islands with the full-length flight deck running between them. Each island contained one funnel; a large net could be strung between them to stop out-of-control aircraft. Aircraft were transported between the hangar and the flight deck by two aircraft lifts (elevators); the forward lift measured and the rear . This design displaced and accommodated six large Short Type 184 seaplanes and six smaller Sopwith Baby seaplanes. The ship's armament consisted of six guns. The DNC produced a detailed design in January 1918 that made some changes to his original sketch, including the addition of a rotating bow catapult to allow the ship to launch aircraft regardless of wind direction, and the ship was laid down that month to the revised design. Progress was slow, as most of the resources of the shipyard were being used to finish the conversion of from a battleship to an aircraft carrier. The leisurely pace of construction allowed for more time with which to rework the ship's design. By