Purple jellyfish in San Diego

me and my homiez saw about 10-20 large (20cm+ umbrella) purple jellyfish just chilling like villains in a marina in San Diego, CA. Very close to shore. Tentacles ranged in length from 10cm to 2-3m. Spooky as hell. We took video from our sweet ride, the AUV Tachyon. Video footage of one of the little buggers (with a shorter tentacle) available at http://www.youtube.com/watch?v=rWA7VPTsrOY.