page_title: Soyuz 23
hierarchical_section_title: Soyuz 23
caption_attribution_description: English: Stamp of the Soviet Union, 1977. Soviet spacecraft Soyuz 23 flight. Русский: Почтовая марка СССР, посвященная полету космического корабля "Союз-23". 1977.
context_page_description: Soyuz 23 was a 1976 Soviet crewed space flight, the second to the Salyut 5 space station. Cosmonauts Vyacheslav Zudov and Valery Rozhdestvensky arrived at the station, but an equipment malfunction did not allow docking and the mission had to be aborted.
  The crew returned to Earth, but landed on partially frozen Lake Tengiz, the first splashdown in the Soviet space program. While there was no concern about any immediate threat to the crew, the capsule sank under the surface of the frozen lake, and recovery took nine hours owing to fog and other adverse conditions. The landing marked the only example of an unintentional splashdown of a crewed spacecraft to date.
context_section_description: Soyuz 23 (Russian: Союз 23, Union 23) was a 1976 Soviet crewed space flight, the second to the Salyut 5 space station. Cosmonauts Vyacheslav Zudov and Valery Rozhdestvensky arrived at the station, but an equipment malfunction did not allow docking and the mission had to be aborted.
  The crew returned to Earth, but landed on partially frozen Lake Tengiz, the first splashdown in the Soviet space program. While there was no concern about any immediate threat to the crew, the capsule sank under the surface of the frozen lake, and recovery took nine hours owing to fog and other adverse conditions. The landing marked the only example of an unintentional splashdown of a crewed spacecraft to date.
caption: commemoration stamp of Vyacheslav Zudov and Valery Rozhdestvensky
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