They passed a door with an emergency exit sign. The Doctor skidded to a halt and went back to the door. "When in doubt, take the stairs!"

Donna pulled open the door and they dashed through.

"We're on floor 7." The Doctor informed the others after glancing at the large '7' written in red paint on the wall.

"Really?" Donna panted sarcastically with barely enough breath from all the running to comment. "I thought that big number there was a 10!"

The Doctor ignored her.

"Come on! Just three floors down!"

"Wait! Doctor!" He stopped and looked up at Donna. "But there'll be just as many guards as last time and we'll get caught again. And we can't risk that with Rose in the condition she is."

"Then what do you suggest we do?" he asked her.

"A diversion." Rose answered. They both turned to her. "Something to get them thinking we're somewhere we aren't. That way maybe the guards'll leave their post."

"Brilliant!" he exclaimed.

"This ought to work." Donna elbowed the glass surrounding a fire extinguisher on the wall. The clattering glass mixed with the sound of the fire alarm that rang through the building.

"Good work, Donna!" the Doctor complimented. "Now let's get out of here!"

They sprinted down the stairs. The Doctor was taking three at a time with Rose clinging tightly to him. When they reached the fourth floor Donna opened the door a crack and saw three guards race past. She looked out and saw two guards at the entrance to the control panel.

"They've still got two guards left." She told the others.

"How will we get past?" Rose questioned.

"The only one who really needs to get past is you." Donna stared right at the Doctor. "I don't."

"Donna, what are you scheming?" The Doctor asked with a touch of apprehension in his voice.

"Just this." She replied. "Get ready. Oh! You'll need this." She handed Rose the keycard.

"Donna! What are you doing?" he cried as she pulled the door open and ran out. He watched as she stood in plain view of the guards and shouted, "Come and get me!" and dashed down another corridor. The guards followed and he waited a second before he darted to the door. Rose swiped the card for him and the door opened to a small room with another door at the end.

"335533." He told her.

Rose reached out and entered the code. The door swished open and revealed a room full of computers and control panels. The Doctor set Rose down in a chair and started to work on the computer. She spun her head around when someone banged loudly on the first door.

"Let me in!" a voice screamed.

"Donna!" Rose exclaimed.

The Doctor stopped what he was doing and ran to the door and pulled it open. Once Donna had run in he slammed it shut again just as three guards closed in.

"Won't they have a key?" Rose asked worriedly.

"You're right!" the Doctor hurried and shut the second door and then raced back to the computer.

"What're you doing?" Donna asked him.

"Changing the code." He said without looking up. "What should I make the new code?" he asked a second later.

"Does it matter?" Rose said bewilderedly.

"Right." He quickly entered '777777.'

"Just in time." Donna whispered and pointed to the door behind which the frustrated cries of the guards could be heard.

The Doctor looked over his shoulder at the noise, then returned to his work.

"Look here!" he called to Rose and Donna.

"Well that's interesting." Rose said.

"Very interesting." The three of them were looking at ten different screens that each showed a part of the holoroom.

"Enlarge that one." Donna pointed to the bottom right image.

The Doctor hit a few buttons and an image of the guards trying to get inside the room they were in filled the screen.

"But that's just outside." Donna noted. "I thought you said we were out of the hologram."

"It's just a security camera then." The Doctor assured her.

"But what if it's not?" she proposed. "And we're still in the holoroom?"

"No!" he snapped. "That's not it. We're out. We have to be."

"Can you turn off the hologram from here?" Rose asked him.

"Yeh."

"Then do it. That way we'll know what's going on."

"Right. Good idea." he flipped a few switches. "There. It's off. And this room's still here."

"No. Look." Donna gestured all around them.

Everything started flickering in and out of existence, and then disappeared. Rose fell over after the chair she was sitting on vanished. The Doctor just stared in disbelief at the massive white walled room surrounding them. He dropped to his knees and held his head in his hands.

"We'll never get out of here." He muttered.