Between 2017 and 2019 the SeaRover project, funded by the EMFF’s (European Maritime & Fisheries Fund) Biodiversity Scheme opportunistically collected deep-sea sediment samples during three offshore surveys. These data were processed aboard the RV Celtic Explorer and ILV Granuaile before being outsourced for high-resolution Particle Size Analysis. Particle size analysis provides information on sediment grain size and distribution which helps characterise aspects of the physical environment within the sample area. These analyses were funded by the EMFF Fisheries Survey Sampling project. The SeaRover samples were collected over three years, 2017, 2018 and 2019 and analysed fully during end 2019-2020.