Jack let out a long suffering sigh and shook his head.

"You're right," he agreed, "you're right but we're not doing any good like this. We need that breathing aparatus. It's stupid going head first into this, we have no idea what this thing is and what it's capable of. It'll be dark out there, Doctor. We should go back to the city, get what we need and do this when it's light."

He looked again to the cave, the way they'd been and the way they came, and again back to the Doctor.

"Are you with me? I don't want to risk this, Doctor."