How long did it usually take to get the CO2 levels back down in the base block?
It depended. Sometimes, we would leave the base block and use a small fan to blow the CO2 out. We would vacate the base block for an hour or so trying to get the CO2 levels back down. The primary sources of oxygen and CO2 removal require electrical power supply. Since the Progress collision, the use of both systems has been minimal and interrupted. Use of the backup systems have been extensive. D. Fatigue and Stress The Mir crew experiences fatigue and stress during their long-duration flights. Several factors contribute to these conditions: (1) conducting constant routine maintenance and repairs, (2) performing scheduled scientific activities with poor instructions from and limited communi- cations with the PI, (3) living day-to-day in a confined environment with minimal contact with family and friends. Limited windows of communication transmission between Mir and ground control also intensifies stress and fatigue. However, as crises confront the crew, the stresses become a greater ri
