It's a great site in winter. During the summer plankton blooms, and viz can drop substantially... You don't have to go deep at all!!! 20 feet and you're in marine city heaven! Tons of nudibranch (even hooded ones!), dead-man finger sponges, etc... Great for beginner dives. At the tip of the rock, it gets much deeper. Never went to the bottom, but I was about 80 feet last time, so you can make it a deeper dive... Rumored to have octopus and wolf-eels there...