Side note - how did the swim / trip go?
There used to be a dive charter that left from San Fran to the Farralon Islands for divers. I always wanted to go. My Uncle would take me out there on his sail boat. Beautiful day always but never dove it.
The charter stopped and I think the main reason was due to the local landlord or so I hear. It was a Great White. At one of the dive club meetings they had the man who used to collect the urchins in the area. He used to call that same Great White the landlord. His talk was really good and how he said the shark never bothered him but he always knew it was around him while he collected.
Never made a dive there although they do excursions out there for GW cage dives. I'd rather go diving in the area though. Monterey has GW's but I guess the Farralon's don't have as big of a draw or it costs to much round trip to get there only to cancel due to weather maybe. I don't know.