At six people, we’re a rather small crew for this boat, and our four-hour shifts make me feel like a newborn baby — constantly put to bed and soon awoken abruptly, given food and drink, and thrust from my cocoon of a hammock-bed into a precarious waterworld above, strapped to the ship by a safety leash. But the crew is healthy and able, the weather’s been gorgeous, playful-seeming dolphins dance along the boat during the day, and magical-seeming bioluminescence dances along at night, and there’s no sign of human life in any direction.