Last year I was working on my teams MATE ROV competition entry, and the electronics box onboard the submersible robot flooded during our first of two trials. I spent the next two days sitting on a concrete pool deck in beautiful, sunny, June California at UCSD trying to rewrite the embedded system's code, squinting at the screen to route around FUBAR'd components such as the onboard computer system that was supposed to handle networking with the dry side control computer.
We did win the guts and glory award though :)
It was so bright that even 10 feet underwater the cameras went blank white until we covered them with five layers of windshield tinting film :D