潜水员探秘墨西哥古老水下洞穴
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近日，墨西哥尤卡坦半岛，潜水员探秘水下迷人而古老的洞穴，这些被称为地下暗河的陨石坑包含许多深度可达180米的通道，最初是由希克苏鲁伯流星形成的，希克苏鲁伯流星被认为导致了恐龙的灭绝。
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