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NOVA takes viewers on an exciting Arctic trek as one team of paleontologists attempts a radical "dig" in northern Alaska, using explosives to bore a 60-foot tunnel into the permafrost in search of fossil bones. Both the scientists and the filmmakers face many challenges while on location, including plummeting temperatures and eroding cliffs prone to sudden collapse. Meanwhile, a second team of scientists works high atop a treacherous cliff to unearth a massive skull, all the while battling time, temperature, and voracious mosquitoes.
http://www.pbs.org/wgbh/nova/arcticdino/