Sea slug
This guy moved surprisingly quickly. You can't tell the scale from the picture but it was about as big as my hand.
Taken Monday, September 03, 2001, 04:48:26pm. Original image size: 1200x1600, 912kb
Technical details: Olympus C700UZ, 1/40s @ F7.0, ISO 100, 146mm
PS6 Curves 25:0 - 70:70 - 255:255, USM 20:100 - 20:20 - 30:4 - 100:0.5