The Antarctic Circumpolar Current (ACC) is the world’s largest and most powerful ocean current. Encircling Antarctica, it flows continuously from west to east through the Southern Ocean and is the only major ocean current to travel completely around the globe.
Pacific ocean
The Challenger Deep
“…we have better maps of the surface of Mars and the moon than we do the bottom of the ocean. We know very, very little about most of the ocean.” – Gene Feldman