Illustration shows how the optical modem could function at a deep ocean cabled observatory. Autonomous underwater vehicles (AUVs) collect sonar images (downward bands of light) and other data at a hydrothermal vent site and transmit the data through an optical modem to receivers stationed on moorings in the ocean. The moorings are connected to a . . . → Read More: New Communications System Promises Untethered, Undersea Vehicles Who Will Destroy the World