Inside the fat base of the descent stage there was a doughnut-shaped compartment. Some of this was taken up with fuel tanks, but the rest was given over to payload. Half of the doughnut was a surface shelter, a tightly curving chamber that would serve as crew quarters and laboratory for the crew while it was on the Martian surface. Then there were surface operations bays, with room for airlocks and equipment, and space for a small Mars Rover.

Sitting on top of the descent stage was a smaller cone, the cabin of the ascent stage. This was a bubble of glass, to give all-round visibility. The crew would ride down to the surface and back to orbit again inside this cabin. It held room enough, just, for four guys, lying side by side in acceleration couches. But you could fold the couches out of the way, so the pilots could stand up to control the final descent.

The rest of the ascent stage was a cylinder, impaled down the spine of the MEM’s descent stage. The ascent stage, rising from Mars, would look like a Kojak lollipop, Lee thought whimsically, a glass lollipop on a stick of propellant tanks and rocket engine, leaving behind a truncated half cone: the descent stage, scorched and decapitated.

That was the skeleton of the thing, anyhow, and the teams soon began to put on some flesh, mapping out the subsystems.

ECLSS, the environment control and life-support system: Jack Morgan’s baby, with molecular sieves to scrub out carbon dioxide, and filtration for water recycling. Electrical supply fuel cells for the descent stage, separate, smaller cells for the ascent. Guidance and control there would be inertial guidance, and rendezvous and landing radar systems, and attitude rocket clusters, and gimbaled main engines to allow thrust vector control. Communications: the engineering models of the ascent stage started to sprout antennae, S-band for TV links to the orbiter and voice to Earth, and VHF for voice links to the orbiter and EVA to MEM links…

Lee had his people borrow where they could. Details in the subsystems, for example: they put in power cells that had already served in the Apollo Lunar Module, an L-band rendezvous radar from Gemini. As for a propellant, should they use the nitrogen tetroxide/Aerojet 50 Grumman had used on the LM? That was hypergolic — meaning it would ignite on contact with its oxidizer, with no need for an ignition system — but it was low-performance, corrosive, not to mention toxic. Not the stuff you’d want to have to store for a year or more as you hauled your MEM out to Mars. There had been some studies of fluorine-based compounds, but they hadn’t been taken too far because fluorine was such difficult stuff to work with. What, then?…

As the teams worked, the design quickly evolved away from the first baseline sketched out by Lee.

That bubble of glass on top of the ascent stage, for instance. It would have given the crew an uninterrupted horizontal field of view, and 135 degrees vertically: it would have been like riding some superb helicopter down to the surface of Mars. But if the bubble was made of laminated glass, it would be too heavy; and lighter alternatives like Plexiglas would discolor and weaken under the intense, ultraviolet-laden Mars sunlight. And, as Jack Morgan was quick to point out, all that glass would overload the environment control system. So the beautiful bubble was discarded, in favor of small, LM-like, downward-slanting pilot’s windows.

And the five-landing-leg geometry was soon upped to six, to provide the broad-based craft with better landing dynamics. To guard against excessive forces on landing, the legs incorporated a crushable aluminum honeycomb, so they would compress, absorbing the force of impact…

It was an exciting, invigorating time.

Lee didn’t spare himself; he charged through the organization, checking, cross-fertilizing, collating, cutting through a lot of what he judged to be sterile crap.

Sometimes he’d realize he couldn’t remember the last time he’d slept, or eaten. Sometimes, in fact, it was only a pressure in his bladder or bowels that made him attend to the human side of his needs at all.

Every day he went home in the dark and left in the dark.

It was incredible. He never even saw the apple blossom in his yard. He hardly saw his kids — two boys, Bert and Gerry, both high-school age — for more than minutes at a time.

He had a little more time with Jennine, but most of that he spent eating, or — if he was lucky and could relax — sleeping lightly.

He worried a little about Jennine, when he thought about it. She’d grown used to the stupid hours he worked, over the years. Although she knew and cared nothing about airplanes, Jennine seemed to understand that these bursts of activity were like brushfпres; they wouldn’t last forever, and then she would have him back. For a while, anyhow.

But she seemed a little more strained, this time, although he couldn’t quite figure out why.

They were both older, he supposed. That was one thing. And the boys were sure a handful.

But the MEM pressure would go away. She would get him back.

…But what if we win?

Then it isn’t going to go away. Is it, JK? Not until 1986, and that ascent stage lifts off Mars, and it’s all over.

But always, the work came crowding back in on him again, shutting out his consideration of anything else.

He kept two supreme goals in mind. One was meeting the proposal submission deadline, and the other was keeping the MEM’s overall weight within the design limits specified in the RFP.

For the first, he had Bella print up a kind of calendar, which he pinned up around the plant and had checked off every day. FORTY-SIX DAYS TO SUBMISSION DAY! AND ROCKWELL IS STILL AHEAD OF US! Lee was proud of this. “It’s kind of like the calendar they had in When Worlds Collide. Do you remember that, Bella? When they were building a rocket ship to get off the Earth?…”

“Yes, sir, JK.”

The weight problem was more difficult to crack.

Every design definition Lee had ever worked on was the same; each subsystem inevitably grew in scope and complexity as the engineers got into the detail. So Lee started to keep a list of best-guess weights for all the various components and subsystems.

Every morning Lee would call his senior people into his own office, into a progress meeting he called a hot griddle. It was something he knew they used at the Strategic Air Command. Seven-forty-five smart and then the doors were locked; the chairs were pushed against the wall, and there was no coffee, so you couldn’t sit down and take it easy. Then, everybody would talk through their top problem for the day and how they would resolve it.

At the griddle sessions Lee handed out weight summaries, showing how far the current aggregate design was over the limit. He was reluctant to start setting weight limits for subsystems — he wanted to find the best trade-off across the whole spacecraft — but he pushed his people every day to figure out what they could do to bring down their net weight, to give the rest a little slack.

Still, the daily totals weren’t coming down fast enough, and the weight issue soon emerged as his major worry.

It wouldn’t matter if, at submission time, they were a little heavy, a little above the target. If they won, there would be plenty of detailed design work to follow. But just then it seemed as if the Columbia MEM wouldn’t even be in the right ballpark.

The weight limits had been set by NASA to fit into their new all-chemical, gravity-assist system configuration. And the limits were thereby much tighter than they had been in previous nuclear-option baselines.

Lee started to worry, privately, that they might be too tight to be feasible.

The issue was brought to a head, at last, by Lee’s closest ally.

Jack Morgan took Lee into a corner of the office, away from the hubbub. Morgan’s face was long, uncharacteristically serious. “JK, I think we’re in trouble.”