High temperature hydrothermal fluids are collected during the MOMARSAT 2011 by gas-tight fluid sampler manipulated and triggered by the hydraulic arm of the submarine vehicle (ROV Victor6000). Several hydrothermal vents are sampled, namely : Aisics, Montsegur, Isabel, Sintra, Y3, White Castle, South Crystal, Tour Eiffel, Cypress, Cimendeff, Crystal.

Several chemical analyses are performed aboard the research vessel: such as salinity and d20/20 by refractometer, pH by electrode (pH standard 4.01 and 7). Regional Node: EMSO-Azores Vent field : Lucky Strike Latitude : 37º17’N Longitude : 32º16’W 1600 – 1750 m depth