In November 1969, just four months after men first set foot on the Moon, Nasa was ready to do it again. Basking in the success of Apollo 11, the agency decided that Apollo 12’s mission to the Ocean of Storms would be even more ambitious.

Unlike Neil Armstrong, who had been forced to overshoot his planned landing site because it was strewn with boulders, Apollo 12 Commander Pete Conrad was aiming for a precision touchdown, within moonwalking distance of an unmanned Surveyor probe. Conrad and landing module pilot, Al Bean, would then spend longer on the surface – with two excursions planned – while beaming back the first colour television from the Moon.

On 14 November, Conrad, Bean and Command Module Pilot Dick Gordon settled into their couches at the top of the 111-metre-high Saturn 5 rocket at Cape Canaveral, Florida. Meanwhile, in mission control Houston, flight director Gerry Griffin took his seat behind his console – his first time leading a mission.

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At the launchpad, the ground was wet from storms that recently passed through the area and the sky is overcast. But with the rocket and crew ready to go, and US President Richard Nixon watching (for the first time) from the VIP stands, all systems were green for launch.

At 11.22, the giant white rocket slowly lifted off the pad and accelerated into the clouds.

“This baby’s really going,” shouts Conrad to his crewmates as the launcher cleared the tower and Houston takes over control. “It’s a lovely lift-off.”

Then, 36 seconds into the flight, Conrad sees a flash. All the fuel cells supplying power to the capsule fell offline and the entire alarm panel lit up.