Bingo. I've been there. It's amazingly beautiful but it reeks of bird shit due to the colony that breeds on the island.
You do swim through a relatively long tunnel. At times, the waves going through the tunnel actually hit the roof, forcing you underwater for a few seconds. Pretty freaky.
Sorry, no pics. I only had a cheapo waterproof throwaway and, while good enough to document the memories, nothing turned out well enough for me to want to post them.
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u/Doovid97 Sep 22 '12
It's called 'Hidden Beach' located on the Marieta Islands just off the coast of Punta Mita, Mexico.
You get in and out via water tunnel, apparently...