Expedition Unknown

On May 24, 1869 a one-armed Civil War veteran, John Wesley Powell, and a ragtag band of nine mountain men embarked on the last great quest in the American West. The Grand Canyon, not explored before, was as mysterious as Atlantis - and as perilous. The 10 men set out from Green River Station, Wyoming Territory, down the Colorado in four wooden rowboats. Ninety-nine days later, six half-starved wretches came ashore near Callville, Arizona.

It began with a secret mission, no expenses spared. Spain, plotting to break Portugal’s monopoly trade with the fabled Orient, set sail from a hidden Mexican port to cross the Pacific - and then, critically, to attempt the never-before-accomplished return, the vuelta. Four ships set out from Navidad, each one carrying a dream team of navigators. The smallest ship, guided by seaman Lope Martín, a mulatto who had risen through the ranks to become one of the most qualified pilots of the era, soon pulled far ahead and became mysteriously lost from the fleet.