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" ... "Some of the targets we were particularly interested in studying in detail were the stalactite caverns from 130 feet to 160 feet deep, formed back when sea level was 500 feet lower, and this was a dry cave ... We also observed the calcium carbonate layer at 290 feet where a great coral reef grew in what was then shallow Caribbean waters," says Bergman, "Among the rocky outcrops and fallen ledges plunged in the silt around the circumference of the Hole, there was also a concentric circle of sand ... Once something falls in the Hole it can’t be washed away in deep sea currents, so anything down there stays put as waterfalls of sand slowly fill in the Hole." ... "
" ... And to really, really get away, there’s Río Secreto just a few miles away from the Cacao. A stunning natural phenomenon that goes back hundreds of thousands of years, the underground river was discovered less than a decade ago (unlike the famous cenote sinkholes of the Yucatán, it is a proper flowing river). Our guide “Gonzo” was extremely knowledgeable in the natural sciences, explaining as we waded through the caverns the behavior of tiny blind catfish, huge spiders with long antennas, and bats flying in and out (though having a photographer trail your group the entire 90 minute excursion is overkill). Visitors walk and swim through only a tiny fraction of the ten-mile cave system. Yet, when you stop and sit in vast, quiet stalactite caverns, you could not feel more removed from the hullabaloo up above in the town of Playa. ... "