Diver core survey undertaken at a Maerl beds in Wyre Sound and off Tingwall, Orkney by Heriot-Watt University for SNH on the 10th, 12th and 14th June 2015. Sampling was for the purpose of a Heriot-Watt University PhD project where SNH were the studentship partner. Replicate core samples were collected by divers at three sites in Wyre Sound and one site off Tingwall.