Tour of a lifeline

Take a walk down the most valuable sidewalk in the world -- the al-Basra Oil Terminal, which Iraq relies on to send nearly 80 percent of its crude to market.

AL-BASRA OIL TERMINAL - The hulking legs of this monster of the northern Arabian Gulf sink deep into the sea bed, holding steady for three and a half decades, through more than 100 feet of sometimes thrashing water.

Its spine arches up and down for nearly a mile, 40 feet above the surface.

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