Villagers have embraced offers of new sanitation systems, homes and bridges. But they don't fully comprehend what Nautilus wants to do starting as early as 2018 at a site 30 kilometers (18.64 miles) off the coast. Located about 1,600 meters (5,200 feet) down, the site is home to a network of hydrothermal vents and near an undersea volcano. It's a harsh environment where mineral-rich water as hot as 400 degrees Celsius (750 degrees Fahrenheit) pours through the vents, meeting icy cold water and forming the concentrations of gold, copper and other minerals that are 10 times what is found in traditional mines on land.

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