 This 7 by 3 mile kidney-shaped iceberg was discovered near the North Pole by researchers studying the Arctic haze during the spring and summer.Although the thickness of the iceberg was 125 feet and it weighed over seven billion tons, it rose only ten feet above the surrounding ice packs and was virtually indistinguishable from the pack ice at any distance.The temporary drift station consisting of insulated huts was first assembled by the U.S. Military, and by the end of May, 1957, a 1500-meter-long runway and most of the station's 26 Jamesway huts had been completed, allowing the commencing of scientific operations.