When the download was complete, Makoto radioed his partner.  "Ok, looks like everything's fine in here. You can come back in and help me with the printer upgrades."

"Roger that, Houston." the man said mockingly.  "returning to airlock."

While Rodriguez made his way back towards the ship's airlock, Makoto pushed the crated 3-d printer from the science module's docking port to the inner ring manufacturing module.  The ship was a series of stacked rings, with the outer ring being habitation, the inner ring being for work, and the central pillar around which it was built being a series of tanks for the ship's fuel and water.  The connectors between the inner and outer rings and the core could also have water automatically pumped into it in order to balance the load while they were spinning.

Halfway through constructing the device, he heard Rodriguez over the Comm.  "Entering the airlock."  A few seconds later, though, the ship shuddered, causing him to hit his head on a hand hold, knocking him out.

When he came to, he noticed the alarms, and the faint vibration of positioning thrusters firing, stopping the ship's tumble.  "Rodriguez, are you there?"  When he didn't get a response, he quickly made his way to the bridge, where he pulled up the internal camera from the airlock.  He saw a tether tieing something to the inside of it, so he tilted the camera, hoping that Rodriguez was merely knocked out.  His hopes were dashed, however, when he saw a damaged suit with a red substance all over the visor.  When the suit had breached, it must have vacuum dessicated Rodriguez.  Makoto could only hope that he was dead before it happened.

He panned around the airlock to see if it was damaged, and was once again disappointed to see a piece of metal imbedded in the seal.  While he might be able to fix it, it would leak like a sieve until it was fixed, and air was too valuable to waste.   He'd have to find another way outside in order to repair it.

Seeing that the diagnostic systems were offline, he quickly rebooted it.  The second it was online, though, more alarms started to sound.  "Danger." the ship's voice said. "atmospheric breaches detected."  He quickly put on his gloves and helmet, then had it run the O2 content sequence while he grabbed a patch kit.

After a tense few minutes, he check the screen on a nearby console and was glad to see that the yellow sections were starting to turn green as pressure returned to them.  Many of the sections, including two thirds of the habitat modules, were gone, though he did have the medical and science bays from the station still attached.  Quickly checking his resources, he saw that the situation was fairly dim.  Firing the VASIMR positioning thrusters had used up most of his hydrogen reserves.  Without a way onboard to generate more, the solar panels hadn't been installed yet, he'd have to conserve power as much as he could.  He quickly switched to minimum power mode and scanned the radio channels for traffic.  While he found a few reports of the explosion coming from Earth, what most interested him was the exchange coming in on one of the EVA suit channels.

As soon as he found an opening, he activated the radio on that channel.  "This is VG engineer Makoto Ito on board the Mars ship, looking for survivors.  Can anyone hear me?"