I use a Nikon Cool Pix 300w. It's good to 100' with no housing. Granted, once below about twenty feet you're gonna want some light with anything whether it's internal flash or added strobe or flood or just a good torch. So far, I'm happy with it's performance.
About 18' deep, natural light, post production in Adobe Lightroom.
About 18' deep, natural light, post production in Adobe Lightroom.