Greeting ocean explorers! It is official – we are sailing. We left port from San Juan, Puerto Rico, yesterday morning and we are now en route to our first sampling location. It was a great feeling to hear the props turning, engines humming and tugboats assisting as we left the harbor. The entire science crew was on deck for the Bon Voyage, filled with excitement and anticipation of the earth’s mysteries that would be revealed during Expedition 340.