You're talking about the SeaVenture at Discovery Cove?
I haven't done it yet, but it looks very cool .
Its quite possible that something will swim up behind you (and all around you), but other than startle you, it would be no less safe than snorkelling in the Grand Reef.
This video gives you a good visual as to what its all about:
Oh cool, you're going to do SeaVenture! I did it last year with my boyfriend, and we're hoping to do it again on our next visit. We loved it. There will be fish swimming around you, but they won't bother you. They're used to guests. Hope you have a wonderful time at Discovery Cove!
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