I did a live aboard on the Nautilus Explorer last month to the Channel Islands off southern California. We covered all of the islands from San Clemente near San Diego, Catalina, the Eureka Oil rig, and Santa Rosa off Santa Barbara. It's been at least 15 years since I last dove in SoCal and it was nice to return to where I first started diving. The Nautilus is just about the perfect dive boat, and we all had a great time. Some highlights I did not manage to capture were a frolicking Humpback whale and my first ever Mola Mola.
Most of these photos were shot with a Sigma 15mm Fisheye lens (Wide angle) and a Nikon 60 or 105mm (macro) and a pair of Ikelite DS-125 strobes.
Here are a few of my favorites:
Kelp forest in the sun

Schooling fish on Farnsworth Banks

Two-spot Octopus

Spanish Shawl Nudibranch (Flabellina iodinea)

Opalescent Nudibranch (Hermissenda crassicornis)

Galleries:
http://www.pbase.com/davehicks/nautilus_may2008
Underwater Slideshow:
http://www.pbase.com/davehicks/channel_isl...;view=slideshow