Tracey Jennings dove in the waters off Costa Rica’s Cocos Island, a 36-hour sail from the mainland. “On this particular dive, at a site called Dirty Rock, I was mesmerized both by how remote and how beautiful the volcanic scenery was,” Jennings writes. “As we swam along, I looked up and noticed a school of horse-eye jacks spilling over the rock like a waterfall.”
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Photograph by Tracey Jennings, National Geographic Your Shot