Voskhod was a short-lived Soviet crewed-spacecraft family derived from Vostok. The three-seat 3KV configuration flew an uncrewed qualification mission, the first multi-person orbital mission, and the long-duration Kosmos 110 biological precursor. The two-seat 3KD configuration added an inflatable airlock; an uncrewed airlock test preceded Voskhod 2 and the first human spacewalk.