Shortly after landing on the planet, all communications from the crew ceased, even when the ship departed. Concerned, the British Space Programme sent Charles Van Lyden in the Recovery 7 to rendezvous with Mars Probe 7. Van Lyden, like Lefee and Michaels, was captured by aliens, who sent three of their ambassadors to Earth in the ship. Shortly after arrival, UNIT was transporting Mars Probe 7 to the space control centre when it was stolen by General Carrington's men. The ship was later relocated by the Third Doctor, but when it was opened it was found to be empty, except for a tape recorder — which was not part of the ship's standard equipment — containing a looped recording of Van Lyden's voice requesting clearance for re-entry, which played every time communication with the ship was atte