GEOMAR Helmholtz Centre for Ocean Research is one of the world’s leading institutions in the field of marine sciences. The mission of GEOMAR is to investigate the physical, chemical, biological, and geological processes in the global oceans and their interaction with the seafloor and the atmosphere. The Centre is bridging the gap between basic and applied science in a number of research areas. Currently, GEOMAR has a staff of about 850, including about 400 scientists. The state-of-the-art infrastructure of GEOMAR includes four research vessels, three remotely operated underwater vehicles and an autonomous underwater vehicle with a depth range down to 6000 meters, the only manned research submersible in Germany (400 m diving capability) as well as a large number of specialized instruments and technologies for ocean and deep-sea research. The overarching research topics of GEOMAR include: (1) the role of the ocean in climate change, (2) human impact on marine ecosystems, (3) biological, mineral and energy resources as well as (4) plate tectonics and natural hazards. GEOMAR contributes to the Cluster of Excellence “The Future Ocean” and the collaborative research centre (SFB) “Climate-Biogeochemistry Interactions in the Tropical Ocean”, funded by the German Science Foundation (DFG).