The warhead, retrorocket, and guidance system were each contained inside the OGCh module. Because of weight constraints, there was no backup retrorocket engine. The solid-fuel retrorocket may have exploded near the end of its scheduled burn. Grissom had initiated the retrorocket sequence and the spacecraft was arcing downward. Discoverer 6 (August 19) suffered a retrorocket failure that prevented the deorbit of the capsule.