1875 – HMS "Challenger" –– In 1875, during her transit from the Admiralty Islands to Yokohama, the three-masted sailing corvette HMS ""Challenger" "attempted to make landfall at Guam, but was set to the west by "baffling winds" preventing them from "visiting either the Carolines or the Ladrones." "These winds pushed her track to the west, across the 35-mile-long depression which, 85-years later, would achieve prominence as the Challenger Deep. Even more amazing, one of her thirteen sampling stations on that 2,300 nm track to Japan was within fifteen miles of the deepest depression in the world’s oceans."