Isthmus Reef and Bird Rock is where
most open water students get their first boat dive.
There are several other good dive sites close by so you can make several dives at different spots without spending a lot of time moving the boat.
The Catalina hyperbaric Chamber is located at the Isthmus.
Access : Boat only
Surge : Mild
Visibility : 30-50ft up to 100ft
Currents : can come up suddenly and very strong
Dangers : current and boat traffic
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