>> proceed. >> we are proceeding with closing the hatch. >> the hatch is closed. >> roger. >> the hatch is closed and we are beginning to purge the cabin to bring it to the proper atmosphere for launch, which is a combination of oxygen and nitrogen, 60% oxygen and 40% nitrog nitrogen. the astronauts are breathing pure oxygen through their space suits. coming up shortly will be another key test with the launch vehicle crew and the spacecraft team combine together with the commander neil armstrong to make a check of the emergency detection system. this is the system that will signal the astronauts in the cabin if anything goes wrong below them. we use the ground-based computer to accomplish this test.