I believe it is only open during the weekends so if you are planning on more than a couple of days of diving that will impact your plans.
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SeaHound,
Its a unique experience. Extremely cold. My father and I only did 2 dives there. He suffers from a circulatory condition called Renard's (sp) syndrome and he was unable to complete the 2nd dive (actually I had to force him to abort) because of the cold. If you've never dove truly cold water before, I wouldn't start here.