Vivian sighed and began doing star jumps to keep herself warm. "We've been doing this for two hours now, and we haven't found any door," she said. "I don't know if you've noticed but the temperature is now minus twenty, and we're both only wearing one layer. If we don't find a way out soon, we're going to freeze."

"Yes, I know," snapped Kirk.

The low temperature combined with Kirk's own lack of success was making him snappy and irritable. "Come on," he muttered. "There's gotta be a door. It makes no sense for there to not be one."

"We've only got one wall left," said Vivian. "Can't we just throw the metal grate at the wall?"

"You're welcome to try it," said Kirk, and Vivian couldn't actually hear any sarcasm in his voice. "Honestly, I'm accepting any ideas at this point, but I don't think it'll work."

"It'll keep me warm for a few more minutes, at least," decided Vivian.

She picked up the grate and spun round a couple of times like she was throwing an Olympic hammer, and then she let it go. It went flying at the wall, only just missing Kirk, and made a rather small dent in the plaster.

"Maybe if I do that ten more times, I could break through," Vivian said hopefully.

"And how many more times do you think you physically could do that?" Kirk asked, having moved on to knocking on the last wall.

Vivian sighed. "Nowhere near ten, that's for sure."

She slumped down on the floor next to the wall again and curled up on her side, closing her eyes.

There was a small click as the temperature on the thermometer dropped to minus thirty.

Vivian protected all the limbs she could, but she was getting incredibly cold and light-headed. "We're done for," she muttered, her head telling her to go to sleep. "If we just give up, maybe the cold won't be as bad."

"No, don't think like that!" Kirk banged on the wall. "There has to be a door! THERE HAS TO BE A DOOR!"

Kirk suddenly kicked the wall in frustration. The place where he kicked it made a significantly different noise than the other places.

"I found it!" gasped Kirk.

He picked up the grating and, doing the same thing Vivian had, flung it at the wall. It made a dent about ten times as large as the one Vivian had made.

"Vivian, I found it!" Kirk ran to his science officer and shook her. "I found it! Help me, quickly!"

But Vivian either could not or would not move. Kirk quickly went back to the grate and threw it again. After two more tries, the wall was weakening. Unfortunately, so was Kirk himself. He only had a little strength left. He picked up the grate one final time, and used all his remaining strength in a burst of explosive energy. As he fell to the floor, he heard a massive crashing sound, which told Kirk his plan was a success.

Immediately after that, he could feel the air getting warmer. It wasn't by much, but it was enough to give him more strength. He went back over to Vivian and pulled the semi-conscious woman upright. Holding her as best he could, he stumbled out of the room and into the corridor. He hobbled as far away from the cold as possible, and when he found a vent in the ceiling that was blowing warm air, he stood himself and Vivian underneath it.

After about ten minutes, Vivian's eyes fluttered open and she was able to stand on her own. The two officers watched colour flood back into their pale and almost blue limbs.

"I am never going to like snow ever again," Vivian declared. "Not after that."

"I agree," Kirk said. "And I am never going to turn the thermostat on the Enterprise down any lower than fifteen degrees ever again."