Space Rocket History #335 – Impacts of Soyuz 11 on Future Soyuz, Salyut-1 & Apollo

It was decided that henceforth, cosmonauts would wear pressure suits for launch and the return to Earth. Also, a system was installed to automatically pump air into the descent module in the event of decompression.  Additionally, the ventilation valves were modified so a premature opening would cause them to re-close automatically.  Of course these changes meant the spacecraft could only accommodate two cosmonauts.

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