This survey, led by Dublin Institute for Advanced Studies (DIAS) (Geophysics section) took place in September/October 2018 on board the RV Celtic Explorer in the North East Atlantic Ocean. This survey was part of the SEA-SEIS project (Structure, Evolution And Seismicity of the Irish offshore) and will involve the deployment of ocean-bottom-seismometers that will sink and install themselves at the bottom of the seafloor at depths of 1-4 km in the North Atlantic Ocean. These record the tiny vibrations of the Earth caused by seismic waves, generated by earthquakes and by the ocean waves. During the survey a deep sea mooring was deployed, and the M6 weather buoy was also recovered. The DIAS OBS deployment survey is part of a new project "Structure, evolution and seismic hazard of the Irish offshore," funded by Science Foundation Ireland (SFI), Marine Institute and the Geological Survey Ireland and started on the 1st March, 2018. This survey was carried out to deploy broadband, ocean-bottom seismometers across Ireland’s offshore.