'Dear Isabel, you are not a mere woman. You know that, and I'm not having you lower yourself like that.' He grinned slightly. 'Though yes. You are quite right. Dark and mysterious caves are always worth exploring, even if they do often turn out to be ominous caves of death and doom.'<br/>He took a glance back. The TARDIS would be okay on her own. She was hardly going to go anywhere. Given this new development, it wouldn't surprise him if she had broken on purpose.<br/><br/>'So.' The Doctor started as he began to move. 'Nobody missing during the day, only at night. What were these men doing out at night? Are you aware of any work going on down in these caves? Quarry work, mining... Anything of the sort? Are we up to that point...? Though I suppose that is really timeless. I apologise. I haven't been Earthbound for a good while. Memory isn't too good in the old age, either.'