The Moon Landing That Became a Rescue

1. A familiar destination

Apollo 13 launched on 11 April 1970 with Jim Lovell, Jack Swigert and Fred Haise. The mission was meant to land on the Moon. Two days later, far from Earth, an oxygen tank in the service module failed catastrophically. The spacecraft’s carefully planned journey became an emergency.

The Moon was still ahead. The mission had already changed.

2. More than a supply of air

The failure threatened oxygen and the electrical power produced by the spacecraft’s fuel cells. A lunar landing was abandoned. Mission Control and the crew now had to preserve enough resources to survive the return. Every system that could be shut down became part of the calculation.

Switching things off had become a way to stay alive.

3. An unexpected lifeboat

The astronauts moved into the lunar module, Aquarius. Built to support a Moon landing, it became shelter for all three men. The command module, Odyssey, was powered down to preserve its resources for re-entry. Hardware designed for one stage of a mission was taking on a very different job.

Their spare room was now the most important room in space.

4. The air problem inside

Removing carbon dioxide became another urgent task. Filters intended for different spacecraft systems did not simply fit together. Engineers on Earth worked out an adaptation using materials available aboard, then explained the procedure to the crew. An improvised connection became part of the life-support system.

A rescue could depend on making the wrong-shaped parts cooperate.

5. Around, rather than down

The return route took Apollo 13 around the Moon. The crew used the lunar module’s propulsion while carefully managing power and water. They were travelling past the destination they had expected to explore. Getting nearer to the Moon no longer meant getting nearer to success.

The landing site had become something to fly past.

6. The spacecraft they finally saw

Before re-entry, the crew separated from the damaged service module and could see the extent of the damage. They also had to leave Aquarius behind. The command module would carry them through Earth’s atmosphere: the lifeboat that had sustained them could not complete the final stage.

Their survival now required abandoning what had kept them alive.

7. A different kind of arrival

On 17 April, Odyssey splashed down in the Pacific. All three astronauts returned safely and were taken to the USS Iwo Jima. Apollo 13 had not delivered a Moon landing. It had demonstrated a remarkable rescue assembled from engineering, teamwork and a shrinking supply of options.

They missed the Moon. They reached the place that mattered.

Sources

• NASA: Apollo 13 mission details
• NASA: Crew and launch-team account
• NASA: Crew returns to Houston