Just to give an update on Orange Grove - I did two dives in Upper OG on Sunday for my Intro class and the basin is EXTREMELY tannic right now, and fairly hot (first dive my Petrel showed 76, second dive it showed 80 degrees). I'd say less than 10 feet of viz (IMO). Cave is perfectly clear and cold though. Beautiful dive, other than having to run the reel from the stairs! Last time I was there it was perfectly clear.
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