Dew Line Is A Land-Based Portion Of The Distant Early Warning (DEW) System. It is A Radar Fence In Greenland. The Structure Is 150 Feet Tall In The Arctic Circle. This 3,000 Ton Building Is Perched 20 Off The Surface Of The Ice Cap. This Is One Of The 4 Sites In Greenland, Is Manned By Captain Hayden, Stationed At Sonderstrom AbB.