The E/V Nautilus will use side-scan sonar surveys and remotely operated vehicles (ROVs) to investigate the area to southwest, south and east of Montserrat where volcanic material has entered the sea. In addition, the nature of several unexplored submarine volcanoes southeast and southwest of the Montserrat will be investigated by ROV exploration. In the area of Dominica, previous work has identified the occurrence of at least three debris avalanche deposits in the Grenada Basin that have formed by large-scale collapse of the island flanks. These collapse have led to the creation of a highly irregular seafloor dominated by megablocks up to several hundred meters in diameter. The E/V Nautilus will explore and sample the blocks using ROVs in order to obtain information about the timing of the collapse events and their specific source areas on Dominica. In addition, ROV exploration will focus on the shallow offshore area of southern Dominica where submarine hydrothermal degassing has been observed and is part of a highly active seismic zone that may represent an area of future volcanic activity.