An oil and gas industry site survey to establish the geophysical and environmental characteristics, as well as safety risks, prior to decommissioning operations at the 53/3c 9A (Horne) and 53/3c-8 (Wren) platform wells. The survey was acquired under licences P786, P852 in January 2015. The block numbers traversed were 53/03a, 53/3c, 53/4b.