Here's a nice collection of photos from the July 2005 International Submarine Races [1]. I've had some trouble finding good shots of human powered subs in the water but there are dozens of well-lit underwater photos here, all taken by Phillip Colla. Subs include Quebec's winning Omer 5, and entrants from the University of Washington, UCSD, Texas A & M and others.
Oceanlight.com - sub photos... [2]