The Scripps Canyon is probably the most popular dive location in San Diego.  An easy shore entry and short swim lead you to a 2000ft deep canyon.  Steep walls lined with kelp, sheer drops, and a variety of sea life always make for an exciting dive.  Jelly fish are common, Humbolt squid have been appearing the past couple season, and a White shark was recently spotted (although uncommon  :). 
Facts about Scripps Canyon, San Diego, CA
 It is in United States- Scripps Canyon, San Diego, CA is in the Pacific.
 - The typical depth is 0-30 Metres 0-100 Feet.
 - The typical visibility is 0-3 Metres 0-10 Feet.