Most of what we know about the ocean just skims the surface, literally. We’ve gathered a large quantity of data on the oceans from satellites, but most of that is based on the top layer of water. Below that, the picture gets murkier. Buoys, ships, and some autonomous rovers have recently added some detail, but it’s nothing like what we get from satellites today. It’s frustrating to everyone from fishermen to the Coast Guard, meteorologists to offshore wind developers. “Getting data from the