The scientific program of the Meteor M184 expedition was dedicated to studies on the intensity of water mass transformation, a synoptic view of the hydrography in the Labrador Sea and the Irminger Basin, as well as submesoscale resolving surveys of fronts. Measurements of the vertical structure of temperature, salinity, density, oxygen, optical properties, and the flow along selected sections have been surveyed during the M184 expedition. Close to the surface, permanent registrations are carried out with the thermosalinograph (temperature, salinity), meteorological data are continuously collected, flow measurements up to 1000 m depth are performed with the ships installed ADCP and surface currents by a X-band marine radar. Detailed surveys on submesoscale fronts were done with autonomous underwater gliders and ship mounted gear. Furthermore, 40 Hereon drifters were deployed to sample the surface flow.