SpaceX's Polaris Dawn early Sunday splashed down in the Gulf of Mexico after a five-day mission that included the world's first commercial spacewalk and humans the farthest from Earth since the 1970s.

A SpaceX capsule carrying four private citizens splashed down off the coast of Florida before dawn 3:36 a.m. ET on Sunday morning, ending a historic mission that included the world’s first all-civilian spacewalk.