The fourth ROV dive of the expedition was completed successfully today and focused on taking a close-look at the biology and other “hot spots” of the Von Damm hydrothermal field. Incredible images of the vents and animals living at the sites were captured by the cameras on the ROV. CTD tow-yo operations were conducted in the evening following completion of the ROV dive to search for hydrothermal vent plumes in the water column. Little evidence of a plume was shown in the in situ sensor data on the CTD, however analysis of water samples through the gas chromatograph revealed an elevated presence of methane, which persists for more than 3km from the vent site.