dangerous times 1

i have, in my short life, and despite not living anywhere remotely dangerous (bar living close to an active volcano), been in a few seriously dangerous situations. it started the day i was born (see my very first post). then, in chronological order:

1) Wales
on a field trip in the Wye valley (which btw, is really gorgeous), we were walking around places where archaeological remains had been found. this included a few caves. near the end of the trip, we found one last cave, which was not on our list. on the wall outside, it said 'danger' followed by something unreadable, covered in plants and half rained out. as stupid young people would have done, we went inside anyway. the first room was just a normal cave. there was enough light to see. the second one was really dark. by then, there were just 3 of us. i was just about to take a step into it when one of my friends told me to wait. he took out a lighter and put it in front of my foot. nothing. nothing as in no ground. a hole. he took a stone that was laying behind him and threw it in. no sound. he pulled me back gently. i was too shocked to move. once we got out again, we looked at the danger 'sign' again and barely made out the words '140-foot drop'. i couldn't believe the entrance to the cave wasn't closed up!