Apollo Soyuz Test Project (ASTP) Apollo Command Module about to splashdown in the Central Pacific Ocean. The ASTP mission was the first joint international crewed space-flight. It took place from 15-24th July 1975. A Soviet Soyuz 19 and American Apollo CSM-111 spacecraft docked in orbit on 17th July to test a jointly-designed international docking mechanism. Photographed on the 24th July 1975.