 What caused the explosion that resulted in the loss of air on Freedom 19?
General Finogenov notified Major Winship that the underground blast was scheduled for the following morning. Air currents whisked it away and plastered it against a riveted seam of the dome. It pulsed as though it were breathing and then it ruptured. Major Winship moved quickly to cut out the emergency air supply which had cut in automatically with the pressure drop. "The only way you can check is to extrude it," Lt. Chandler said, "and if it does extrude, you've ruined it." The Soviet base was situated some ten miles toward sunset at the bottom of a natural fold in the surface. At that point, the best pathway angled left and made an S-shaped descent to the basin.
 The calking mixture leaked onto the air tank.
 The room became too hot from overcrowding  The calking mixture leaked onto the air tank.  The compound mixture became too hot because of the lack of the air reconditioner  The compound mixture was mixed too quickly.