I only just realised that I messed up Mark and Zita's parent's years of death, so I went back and sorted that out. So you don't have to look back, I'll just put them here:

Mark born 8 YPN (Years Post N-day). Father dies 9 YPN. Mother dies 18 YPN.

Zita born 9 YPN. Parents die 20 YPN.

Tunnels

Mark felt like he was being squeezed into a small tunnel, then suddenly he found himself in front of a row of black buildings. He felt so dizzy that he sat down on the floor and held his head in his hands. "Don't worry, everyone fells sick after teleporting for the first time," Jacob said. Mark got up shakily. Zita looked a bit white, but she managed to walk over to the nearest building.

"I guess this is the store house," she said going inside. Jacob followed, and Mark managed to walk after him. Inside, there were iron chests on top of each other. Mark looked inside one.

"What's this?" he asked, holding up a black orb.

"Dark matter," Zita said. "We use it to make magic items, and weapons. My sword and Jacob's pick are made from it."

"How powerful is it?"

"Stronger when diamond when used as a weapon, and highly magical."

Mark put it back, then followed Zita and Jacob to the back of the store house. A turret base was on the floor, weakly buzzing. Jacob kicked it over, then tapped a chest next to it.

"This was the one that the Nova Cataclysms where in. Six are gone." Zita frowned.

"But that discovered before. And there was no turret, which means it must have been placed after the theft was discover, which seems a bit un-logical."

"Unless," Mark said thinking, "there's something that needs to be protected." He spotted something black in between the cracks of floor next to the turret, and pulled it out. He showed it to the other two, saying "this is a piece of high-flex metal, which was used to make protective cloths… like Nano-armour. Why would it be here?"

Zita tapped her foot on the floor. "Maybe during the theft it was accidently torn off?"

"But it was in the floor crack…" Jacob said, then he grinned. "Stand back a mo." Mark did, realising what Jacob had. Jacob swung his pick at the floor, and it exploded, sending dust and shards of stone everywhere.

"Next time, warn us when you plan to do that, Zita said, coughing.

"It worked though," Mark said, pointing. A tunnel had been revealed. Jacob jumped down into it.

"I guess this is how they got in, and managed to get out as well. It seems to go on for a bit. Shall we?"

"Let's," Mark said climbing down. Zita climbed down after him, and used one of her rings to light her hand on fire for light. They started down the tunnel but it only went a short way before another tunnel branched away and up. "Looks like we have to split up," Mark muttered, looking down both passages. Jacob nodded at the one going up.

"You two take that one, it seems to be going up towards the city. The other seems to be heading towards the wastes."

Mark nodded. "Once we find the end of the tunnel, we should all meet back down by the store house." Jacob nodded, then ran down the straight tunnel. Zita guested up their tunnel.

"After you?" Mark sighed, and started to climb up it. Sometimes the tunnel went at a high angle, sometimes straight up, but for the most part it was only tilted up a bit. They had been walking and climbing in silence for ages, when Mark decided to ask, "Zita, in the graveyard, there was a stone with the names Charlie and Rosemary Magi. Were they… you parents?" He couldn't see Zita's face very well, but he thought she might be trying not to cry.

"My parents… were both Wastes scouts. It was their job to scout the wastes, to search for useful items or large groups of mutates. Their Harvest bands protected them, but the small amounts of radiation gave me my eye colour. Then one day, when I was 12, they went out and never came back. The Great Sage taught me my magic, and everyone helped me growing up. It was hard."

"I can guess," Mark muttered.

"Can you?"

"1 year after I was born, my father died from cancer, caused by radiation. My mother had it as well, but she managed to stay alive until I was 11. I had a few friends that helped me to survive, until I was old enough to join the Tekkit Police Academy. After that… wait, can you see something up ahead?"

Zita and Mark stopped. Up ahead, at the end of the tunnel, a strange device seemed to have been cobbled together. Slowly approaching, Mark recognised a signal receiver. "Whatever this thing is, it seems to be remotely controlled." Zita frowned.

"What's that under… oh no."

"What?" Mark asked.

"It's a Nova Cataclysm."

"Which makes this a…." Mark stopped as a light went blinked on the receiver. "Run" he said. He and ZIta ran back down the tunnel. Just in time, as the Cataclysm exploded behind them, making the tunnel collapse.