I also have done retics in the wild and some bat cave stuff. The caves are stale, humid but cool places. They are dark, of course. If there are bats, the extremely sharp rocks and slippery muddy floors are covered with guano. The odor will be choking sometimes. There are various insects, worms, crabs, snakes(sea snakes if near the sea) and who knows what else that may venture inside. Personally, I am the adventurous type, so I generally bare it in the interest of exploring. I couldn't even image wading through that water, I would probably draw the line at that just for my personal health.
The retic was quite small but while viewing a related link on "youtube" to see if I could get a shot of the actual bite, I was successful. He did actually receive a suprisingly bad slash/tear type bite from that snake in a very sensitive area that would cause a lot of pain. I have received some pretty bad bites by some big stuff and never reacted like that. Then again, I have never been bit on the back of my leg but I have been inked there and I can attest to the sensitivity.
DM EXOTICS