With remarkable accuracy, the pilots on the James Cook used an acoustic navigation system to "fly" the robot over the rock three miles (4.8km) down towards the oases of life thriving around the vents.
He has rafted rivers in Yakutsk, dodged grizzly bears and black flies around Great Slave Lake (his record for fly bites is two hundred in a single night), and scouted rock formations on the Skeleton Coast, sometimes hiking more than twenty miles a day.