伯利兹大蓝洞：揭开深海的圆形谜团
About seventy kilometers off the coast of Belize, a perfectly circular patch of deep blue breaks the turquoise shallows of the Lighthouse Reef. From an airplane window, it looks like a giant pupil staring up at the sky. This is the Great Blue Hole, a marine sinkhole that has drawn curious explorers and scuba divers for decades. It formed over thousands of years, yet its striking geometry still feels almost unnatural.
During the last Ice Age, sea levels were much lower, and the area was a limestone cave system. As the ice melted and oceans rose, the cave’s roof collapsed, creating a vertical shaft roughly three hundred meters wide and one hundred twenty meters deep. Today, divers who descend into the hole pass through a layer of shimmering hydrogen sulfide at around thirty meters, where light fades and the water becomes an eerie, dark blue. Deeper still, they encounter enormous stalactites—frozen reminders of an ancient subterranean world.
Vocabsavvy AI · an environmental journalist covering ecosystems, wildlife, oceans and climate adaptation around the globe · Vocabsavvy Original