The crew were in a pressurized compartment in the forward fuselage and consisted of a pilot, co-pilot, two navigators, and air signaller (later called an air electronics officer (AEO)). Manufacture of this pressurized section was subcontracted to Saunders-Roe. The pilot and co-pilot were located side by side on an upper level, the remaining three crew sat at stations lower in the cockpit, and faced to the rear. A crew of five had been enabled by the discontinuation of defensive gun turrets and accompanying air gunners, a design philosophy proved by the successful De Havilland Mosquito bomber of World War II. The pilot and copilot were provided with Martin-Baker Mk.3 ejector seats, while the rear crewmen were expected to bail out of the oval main entrance door on the port side of the fuselage. It has been claimed that the survivability of the rear crewmen was substantially reduced due to the ineffectiveness of this method of escape.