"The largest group of failures though were among the Canon 5D MKIIs. Of the 26 samples of this camera onboard, one quarter (six) failed at one time or another, and while three recovered, the other three never did. In all cases it appeared to be water or humidity damage. Of particular concern were two cameras which stopped working while completely protected within Kata rain covers during a light rain ashore. They came back to life the following day though and were mostly fine for the rest of the trip, but one died permanently just before the end of our voyage."
For more of the article, go to Luminous Landscape.