I've been thinking about cameras lately since mine have been on the fritz.
Many of the popular cameras actually have underwater housings available and Pat and I have housed several digital cameras over the last few years. The onboard flash on most of them has it's limits and many people look for extra light by adding an external flash. Last year I picked up an Olympus flash and it's appropriate housing for my Olympus SP 350 set up, but it was so bulky I never really used it.
The other day I was checking things out and found this new offering by Olympus...
Olympus UFL 1 - Underwater flash - 14 (m) It's a stand alone underwater flash that is compatible with many of the Olympus underwater camera housings that have a hot shoe, offering TTL exposure without the hassle of wires and strobe trays. I wish they had it back when I was looking. This Amazon price is actually a very good deal, as a housed Olympus flash will cost much more, and trying to get TTL exposure with another brand of flash will run you some serious dollars and effort.
I'll leave you with a sunset photo from quite a while ago. I may have posted it a couple years back, but it may have been a vertical shot rather than horizontal.