Here’s the link: http://www.mexicodivers.com/
I went with Mexico Diver during 4th of July 2017 & took this video:
But if you come during the snapper spawning, you might get lucky to see these:
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I am more surprised by the lack of boats than the number of sharks. I went last summer plenty of whale sharks, and a few mantas showed up. But dear god there were dozens of boats at the sites. It was fun, I probably wouldn't do it again, not because I didn't find the whale sharks or mantas interesting, but I would rather go some place where I can dive with them.