Scientists aim to reach the mantle and bring back rock samples for the first time in human history

IODP scientists have selected three different sites in the Pacific where the crust is thinnest—it was formed relatively quickly at spreading mid-ocean ridges, where new crust crystallizes as the plates move apart.

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Although drilling from a floating ship out at sea presents many difficulties, going through the oceanic plates that make up the seafloor is a much easier way of getting to the mantle than trying to drill through the continental plates—the ocean crust ranges from four to six miles thick, whereas the continents go 20 to 30 miles down. Still, penetrating the oceanic crust will be an unprecedented challenge.

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The equipment will be lowered down through more than a mile of water, and the stress that the tungsten carbide drill bits encounter as they grind through hard igneous seafloor rock requires that each bit needs to be replaced after just 50 to 60 hours of use. The extreme narrowness of the hole itself just 11 inches wide also increases the difficulty of the operation.


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As the drill descends, the team will repeatedly retrieve rock cores roughly three inches across and 30 feet long for scientists to study. Subscribe or Give a Gift. Humans Reached the Roof of the World 40, Years.


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