"Going through my mind was a very simple equation in here. Today, we're either going to land, we're going to abort, or we're going to crash."

- Gene Kranz speaking about Apollo 11, the moon landing

Eugene Kranz was the director of mission operations at Johnson Space Center in Houston. Kranz joined NASA in 1960, eventually working with all of the odd-numbered Apollo missions. He retired in 1994 and is now a sought-after lecturer.

He made the following comments in "To the Moon," a PBS documentary broadcast July 13, 1999.

On the importance of the Gemini program, which included 12 flights from 1962 to 1966 and marked the first extra-vehicular activity - or space walk - by an American.

"Gemini's job was to develop, test, and prove the technologies we needed to go to the moon.

"It was the essential stepping stone. From a standpoint of success, it was 100 percent successful.

"We developed the systems technologies, we developed the confidence in our ability to use these technologies. We demonstrated the ability to fly for long durations, to rendezvous two spacecraft.

"Probably the most difficult one was the one associated with extra-vehicular operations (EVA). Because we were completely, almost taken aback. We had a very successful Gemini 4 EVA with Ed White, and then I had the Gemini 9 EVA and we fell flat on our face.

"We found out we didn't have the proper positioning aids, restraints, training, the suit technologies. We didn't have the anti-fog compounds to keep moisture off the faceplate. And yet, we still didn't learn our lesson there.

"We went through a very difficult Gemini 10, Gemini 11, and then we had one of these science groups come in and say, 'Hey, you're doing it all wrong.'

"The last block to fit into this matrix we had to develop for Apollo was extra-vehicular operations, and we closed that out in our final mission."

On Apollo 8, man's first trip around the moon, Dec. 21-27, 1968:

"Oh, I was fortunate. I was probably the most fortunate person in Mission Control, because I wasn't working the mission.

"Cliff Charlesworth had picked this mission up, and I was absolutely mesmerized by what was going on. I mean, sitting next to him in Mission Control throughout the maneuvers, and all of a sudden you find out that - my God, the crew has left the Earth's environment.

"OK, it's now on the way to another planet for the first time, so holy cow, this is something. And then the thing that really came down and grabbed me was the crew would describe the (moon's) surface as they saw it. They would describe the backside, and then they started naming surface features for the people they thought got them there - astronauts and the pioneers who had died on the way to the moon.

"And you sit there and you say, my God, I'm glad I'm a spectator at this thing as opposed to having to do something, because I got so involved in what the crew was saying.

"And then when they read from the book of Genesis, I cried. And that's all there is to it. I mean, this was, there is no question, there are a lot of times in my life when I've been brought to tears by just the power, the immensity, the beauty of what we were doing, and this was one of those days."

On mission control:

"Well, the nature of Mission Control as it emerged from Mercury through Gemini and into the early Apollo was really one of an incredibly and intensely dedicated team of very young people. My controllers at the time of the first lunar landing - our average age was 26.

"I was 35. I was the old man in this room, essentially. The controllers had come up, they had developed a set of values that are expressed by simple words: discipline, morale, toughness, competence, commitment, teamwork.

"And it was these characteristics that built the chemistry that would keep us together both in good times and especially in bad times. The hours that we worked were incredible. I don't think anyone ever worked anything less than 10 to 12 hours each day. Saturday was a normal day of work; in fact, that's the way we felt it should be.

"We were given this impossible dream by President Kennedy, and we were living it. We were doing the kinds of things that engineers would kill for.

"And as part of this process, we'd go and open up our pay - we were surprised we were getting paid by this thing here. As long as we had enough money to make things meet, that's all we needed. The job was our life, and we lived this literally every day.

"And this room, it's a marvelous leadership laboratory."

On the Apollo 11 moon landing:

"It was really amazing how this team completely had lost sight that this was the day of the lunar landing. That we had really gone for the moon. This was just another problem that we had to solve.

"As we got close down, we watched the clock, and normally (in simulations) we had landed on the surface of the moon about 10 minutes from the time that we had started the engine on our way down. We were now 10 minutes and we weren't even close to the surface. So we knew it was going to be a horse race. Are we going to run out of fuel?

"That started becoming the next critical issue, and at the time that we got the 60-second call from my controller, we still weren't close. And we don't have a very precise fuel gauge. What we have here is a controller who is eyeballing how much the crew is throttling up and throttling down.

"About the time we got the 30-second call the crew said, hey, we're picking up some dust and we knew then that we were close and then I knew that no matter what I would say or do from now on, this crew is going to go in for the landing.

"So we just shut up here on the ground, and all we were doing was letting them know what their fuel status was. We landed somewhere with about between seven and 17 seconds of fuel remaining. That's the size of uncertainty that we had in our ability to measure fuel at that time. It was a horse race."

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