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... In that moment, Hadfield did what leaders must do in crisis: solve the problem.

He split the crew. Two astronauts were sent to check gauges and figure out what was leaking. Two more dug into the ship's data for clues. From the command seat, Hadfield coordinated with Mission Control in Houston.

"You never have enough information," he said. "And sometimes your leadership is at speed."

After piecing the evidence together, they realized the main cooling system was venting into space. If it failed completely, the crew would have to abandon the ship.

They solved the problem, but not with instant answers. What looked like a split-second decision was really the product of decades of training, rehearsal, and competence built long before the crisis, Hadfield said. ...