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Link: Wired Two Arctic scientists seeking evidence of an ancient asteroid strike on the Arctic Ocean floor have created a research vessel that can cross thick ice that icebreakers cannot penetrate. American John Hall and Norwegian Yngve Kristofferson have outfitted a hovercraft to help them test their hypothesis about an ocean-floor anomaly above Greenland and Canada's Ellesmere Island. "The neat thing with a hovercraft is that you drive with the same ease over 10-centimeter-thick ice as you do with 5-meter thick ice," Kristofferson says. The rig is set up for weeklong trips over the ice.