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If there's ever a place that makes us feel religious, it's at the so-called "Mouth of Hell" at the Masaya Volcano in Nicaragua. This massive 1,500° Fahrenheit lake of molten rock as deep as the Empire State Building is high is a huge threat to the millions of Nicaraguans.

In a race against an unpredictable natural disaster, Sam Cossman and an international team of researchers stage the world's first dangerous zip-line descent onto level zero (literally the lava's bubbling edge). Here, they plant a sophisticated network of 80 sensors to gather data and give scientists early eruption warnings.

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