In reply to steveP:
I have the Olympus TG-2 which I use for my caving trips. The f2 stop on the TG-2 makes it extremely useful in caves.
I know guys who also take caving pics with the Panasonic Lumix DMC-FT25 and get very good results. The FT25 was my second choice after the TG-2 but I had the cash so was willing to splash out.
I'm a complete punter at taking pics but the Olympus does everything I wanted it to with absolute ease.