Its hard to tell if they are using ocean currents to propel themselves or if its camera tricks and whats up is down and down is up….really cool no matter how they pulled this off.
“Just like in the space, there isn’t anymore a top or a bottom. There isn’t anymore upside down and wrong side out. The ocean becomes cosmos, the man a satellite, and the bottom of the sea an unknown planet. Welcome in the fascinating universe of Ocean Gravity.”