This happened.
http://www.huffingtonpost.com/2012/01/19/venezuela-helicopter-crash_n_1217327.html
The people who died in that helicopter crash were friends of our VZ hosts, and there was much sadness on the tepui. But we finished our work, and truly understood why the helicopters couldn't fly and pick us up on-schedule due to clouds and rain. We got off the tepui only a day late, as there was a break in the weather.