Kosmos 57

Kosmos 57 (Russian: Космос 57 meaning Cosmos 57) was an uncrewed Soviet spacecraft launched on 22 February 1965. The craft was essentially an uncrewed version of Voskhod 2. Its primary mission was to test the Volga airlock. The test was successful, but the craft was lost shortly after. The spaceflight is designated under the Kosmos system, placing it with many other Soviet scientific and military satellites.