The Truth About the Hidden Beach: Did a Military Bomb Create It?

There's a beach inside a crater, hidden in the middle of an island, that you can only reach by swimming through a tunnel. It's called the Hidden Beach (or Playa del Amor), on the Marietas Islands off Punta de Mita. And there's a great legend about it: that the crater isn't natural… a military bomb made it. True or myth? We looked into it.

The myth: did a military bomb create it?

The version everyone tells: in the early 20th century, when the Marietas Islands were uninhabited, the Mexican government used them as a firing range for military and bombing practice. One of those explosions supposedly opened the crater that now hides the beach. Sounds like a bar legend… but.

True or false: the answer

It's largely TRUE. It's documented that Mexico used the islands for bomb testing in the early 1900s, and those controlled explosions shaped caves, arches, and — most likely — the sinkhole above Playa del Amor. The honest nuance: the beach itself is natural (rock erosion), but the crater covering it is, per the records, the work of the bombs. So next time someone tells you the myth, now you know: it's not a myth, it's history.

How Cousteau saved it

The hero of this story is oceanographer Jacques Cousteau. In the late 1960s he launched an international campaign to stop the bombing and protect the islands' marine life. It worked: the military practice ended, and in 2005 the Marietas were declared a National Park (and later a UNESCO Biosphere Reserve). From bombing range to protected sanctuary.

How to visit today

That's exactly why it's so protected now: only 116 people per day are allowed, with a permit and an authorized operator, and you reach it by swimming through a tunnel in the rocks (sometimes with a life vest and helmet, depending on the tide). That cap is why it's still paradise. If you go, take in the islands' wildlife too — it's part of the same secret wildlife calendar of the bay.

The moral: one of the most beautiful corners of Riviera Nayarit was born from something as ugly as a bomb, and today it's a sanctuary. Not a bad metaphor. And if you like stories where Vallarta comes out on top, check out how a Hollywood scandal put it on the map or the forbidden spirit of the sierra.