Amazing 3-D Tour of a Chinese Supercave

<div dir="ltr" style="text-align: left;" trbidi="on"> <div dir="ltr" style="text-align: left;" trbidi="on"> <br /></div> <iframe allowfullscreen="" frameborder="0" height="365" scrolling="no" seamless="seamless" src="//assets.nationalgeographic.com/modules-video/assets/ngsEmbeddedVideo.html?guid=00000146-9713-de67-a367-d73770390000" width="640"></iframe><br /> <span style="background-color: white;"><br /></span> <span style="background-color: white;"><span style="font-family: "Helvetica Neue"; font-size: 14px; line-height: 20px;">China’s Miao Room is considered the world’s second largest cave chamber by area. Enormous and dark, it’s a challenging place to map—but equipment worth more than $100,000 captures what the eye ca<span style="color: white;">nnot</span></span><span style="color: white; font-family: "Helvetica Neue"; font-size: 14px; line-height: 20px;">.</span></span></div>

Amazing 3-D Tour of a Chinese Supercave

China’s Miao Room is considered the world’s second largest cave chamber by area. Enormous and dark, it’s a challenging place to map—but...

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