High Quality Content by WIKIPEDIA articles! During the three day explorations of the Moon by Scott and Irwin, Worden had a busy schedule of observations. Apollo 15 was the first mission to carry the SIM bay, which contained a panoramic camera, gamma ray spectrometer, mapping camera, laser altimeter and mass spectrometer. Worden had to operate the shutter and lenses on the camera and turn on and off the various instruments. During the coast back to Earth, he would perform an EVA to retrieve film cassettes from the cameras.