Using multiple autonomous vehicles simultaneously, an interdisciplinary team of scientists and engineers returns to the United States after exploring the North Pacific Subtropical front—a sharp boundary where cold fresh waters from the north meet warm salty waters from the south. The fronts are the most conspicuous oceanographic phenomena and the goal of this project was to demonstrate the use of distributed autonomous robotics to detect, track, and characterize these complex and dynamic processes with high accuracy across large spatial and temporal scales.