Apollo Thirteen: Houston, We've Had a Problem Here. April Thirteenth, Nineteen Seventy

Fifty-five hours and fifty-four minutes into the Apollo Thirteen mission, an oxygen tank in the service module ruptured two hundred five thousand miles from Earth.

The first transmission to the ground, from command module pilot Jack Swigert, was careful and precise: Houston, we've had a problem here. Commander James Lovell repeated it to Mission Control moments later. The mission control room at the Johnson Space Center in Clear Lake, Texas received the call on April thirteenth, nineteen seventy, and the four days that followed became the most intensive improvised engineering exercise in the history of American spaceflight.

The line that most people know from movies and television, Houston, we have a problem, was not what Lovell said. The actual phrasing, the past tense, we've had a problem, was Lovell's accurate description: the problem had already occurred. The tank was already gone. The question was what to do next.

What the flight controllers at Johnson Space Center did next was use the lunar module as a lifeboat, route the crew around the Moon on a free-return trajectory that the mission had not planned for, and calculate a re-entry path that depended on knowledge of the module's remaining battery power to the watt-hour. The astronauts, Lovell, Jack Swigert, and Fred Haise, survived temperatures near freezing in the darkened spacecraft, conserved water, and trusted the room in Texas to solve a problem nobody had rehearsed.

They splashed down in the Pacific Ocean on April seventeenth, nineteen seventy, four days after the rupture. All three men survived.

The Apollo Thirteen mission is now studied in engineering and business schools as a case study in crisis management: how a team with imperfect information, limited resources, and irrecoverable constraints found a solution by combining everything they knew. The room that solved it still exists at Johnson Space Center, preserved as it appeared during that week.