hms "furious" was a modified built for the royal navy (rn) during the first world war. designed to support the baltic project championed by the first sea lord of the admiralty, lord fisher, the ship was very lightly armoured and designed to be armed with only two heavy guns (18-inch), one forward and one aft, plus a number of lesser guns. "furious" was modified and became an aircraft carrier while under construction. her forward turret was removed and a flight deck was added in its place, such that aircraft had to manoeuvre around the superstructure to land. later in the war, the ship had her rear turret removed and a second flight deck installed aft of the superstructure, but this was less than satisfactory due to air turbulence. "furious" was briefly laid up after the war before she was reconstructed with a full-length flight deck in the early 1920s.