Poster of the crew of the Soyuz 11 mission (6-30 June 1971). Seen here are Georgi Dobrovolski, Viktor Patsayev and Vladislav Volkov before launch. Soyuz 11 went disastrously wrong. The crew spent 23 days onboard the Salyut 1 space station. On re-entry there was a leak in the descent module. When it landed the crew were found asphyxiated due to the loss of atmosphere from the module. Following this, Soyuz crews were reduced to two so that there was room to wear spacesuits on take-off and landing.