MMT (Marin Mätteknik) ran the 2021 site-specific survey campaign at Pentland on behalf of Highland Wind Limited, covering both the array area and offshore export cable corridor between June and July 2021. Geophysical work used multibeam echo sounder, side-scan sonar, sub-bottom profiler and sparker/boomer to support engineering and EIAR inputs. Concurrent environmental and benthic work comprised grab sampling, photographic documentation and seven standalone video transects across 21 sampling sites characterising seabed habitats, macrofauna and sediments for the offshore EIAR.