Meet the hull crawler. Think Roomba robot, but for your ship’s hull — a remote rover that could keep sailors from having to squeeze into tight spaces or going over the side. It’s a shoe-box-sized robot that clings to a ship’s hull with magnets, a device initially built to scout out the underwater mines divers could place along a ship’s hull. But now, designers are looking for additional uses that may assist sailors in more mundane tasks, like spotting corrosion along the hull or motoring into hard-to-reach places like tanks and voids. The system — which is not in the…