Found the diving from Placencia to be far less than stellar, certainly not enought marine life and the visibility too poor to justify getting hammered by high waves on the long ride out, and when exiting and entering the small boats used. Here's some examples of what diving from those boats did to me.
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Most of the marine life was at the place that fishermen dump guts after cleaning their catch - and most of that was nurse sharks. Big whoop. Elsewhere it was scarce and small/immature. And I don't think it was because of the dive op since the one I dove with has a solid (though undeserved IMO) reputation.
There are way too many dive venues with much easier diving, way better visibility, and orders of magnitude more and better marine life. Maybe you haven't been to any of these. Maybe I'm spoiled by having dove these venues first. But the sites I saw off Placencia were very similar to those off Roatan - overfished and devoid of large, mature, diverse marine life. Though I have to say Roatan has orders of magnitude better coral, soft coral and bryozoans than where I was taken from Placencia.
So no, I don't want to throw money away going to venues that aren't full of marine life. It costs too much, it takes too much time and effort, and I have too little time left to waste it on places that aren't top notch.
===> Ignore.