Last August I went for a fun diving trip in Indonesia for 10 days, and on the second day flooded my strobe. I spent the rest of the time shooting with natural light, which was nice for a couple of reasons--first of all it made the whole rig so much smaller that it was not such a pain to haul around; next I was forced to do manual white balancing, adjust the exposure compensation, and shoot up to get more light into the lens. I think it was actually more technically challenging to take pictures without a strobe and have them come out reasonably well with only minor digital darkroom processing to do than it is to shoot with a strobe. I kind of liked it, from a learning standpoint. I have to admit, though, that I quickly replaced that flooded strobe!