Diving the Great Blue Hole
<p>Nearly two hours’ ride off the Belizean Island of San Ignacio, I dove into the Great Blue Hole.</p>
<p>I felt the excitement of donning gear and splashing into warm water, descending beyond the depths that human lung capacity can support. (After a few years of diving, I’d lost that nervousness as things have become mostly instinctive.)</p>
<p>The dive site is a barrier reef, an atoll, but at its essence, it is a geologic dive. The hole is the formation of a cenote–a subterranean cave formed from millenia of percolating water eroding out a cave before the ground above was itself eroded away. The ocean levels rose with the melting ice caps of the last ice age and, as far as I’m concerned, there’s been a dialing up of heat ever since, bringing these waters to bathtub temperatures.</p>
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