The Most Famous Thing NASA Ever Built Was Made of Duct Tape

Two hundred thousand miles from Earth, three men were being slowly poisoned by their own breath, and nobody could reach them.

Say that plainly before anything else, because the tidy version of this story loses it. Carbon dioxide is not discomfort. It accumulates in a sealed cabin until confusion comes, then unconsciousness, then death. No rescue existed — not at any price, not from any direction. If the air went bad, Lovell, Swigert and Haise were going to die in a small metal room a quarter of a million miles from home.

And they were going to do it in public. The accident had put the mission back on every front page. When they finally came down, forty million Americans watched the splashdown live on all three networks, and more watched outside the United States. The audience was already assembled. It was going to see whichever ending arrived.

The lunar module was built to keep two men alive on the lunar surface for two days. It was holding three, and it had to hold them for four.

The command module had spare scrubber cartridges in quantity. They were box-shaped and fitted box-shaped holders. The lunar module’s were cylindrical. So the problem, with the number on the gauge climbing, was to make the wrong filter fit the wrong hole using only what was already aboard.

That problem went to the ground, and the people on the ground were working against the same clock the crew was. Engineers were handed an inventory of everything known to be aboard the lunar module and told to build an adapter out of it — no substitutions, nothing that could be sent up, and a deadline set by the air three men were still breathing. Every hour spent designing came off the margin on the gauge.

What they came back with was assembled from plastic covers ripped off procedure manuals, duct tape, and whatever else the cabin happened to contain. NASA called it the mailbox. Joseph Kerwin read the instructions up to the crew over the course of an hour. Swigert and Haise built it. Carbon dioxide levels began dropping immediately.

Nobody in that story got to choose their circumstances. Not one of them had the right equipment. The engineers could send nothing up, the crew could order nothing in, and the deadline was set by the air in the room.

What they had was a table of junk and an hour of attention, and it was enough — because they worked the problem in front of them instead of the one they would have preferred.

Lovell called it a fine example of cooperation between ground and space, which is a very calm way to describe not dying while the world watched.

Most problems are smaller than that one. Almost all of them are handled worse. The reflex is to inventory what is missing.

The reflex that brought three men home was to inventory what was on the table.

Start there.