Her father takes a good look at each of the thrusters in turn. "Clear," he responds. A moment later, something begins to thrum inside the ROV, and a stream of bubbles spurts from an orifice on its tail, and then the thrusters begin to spin around. They swivel on the ends of their stubby wings until they are facing downwards, throwing fountains into the air, and the ROV sinks rapidly. The fountains diminish and become slight upwellings in the sea. Seen through the water’s rough surface, the ROV is a yellow splatter. It shortens as the vehicle’s nose pitches down, then rapidly disappears as the thrusters drive it straight down. "Always kinda takes my breath away to see something that costs so much going off to who knows where," Doug Shaftoe says meditatively.