We are using an Autonomous Underwater Vehicle (AUV) to survey our study area before we dive with the ROV in August, in order to create a high-resolution baseman of the area and to identify sites of active fluid discharge. The final base maps will have a lateral resolution of 20-25 cm and a vertical resolution of 1-2 cm. This is the first time that this state-of-the-art surveying technology has been used in the lake, and we’re excited about the maps we will produce. Photos by Rob Sohn, WHOI. Work was completed under an authorized Yellowstone Research Permit.