Due to its exposure to the ocean currents and its relative accessibility of slipways at Porthgwarra and Lamorna, the Runnel Stone is known as one of the best dive sites in the whole of Cornwall. Diving must be carried out at slack water, which is about one and a half hours before high water at Newlyn. The highlights include visibility of up to 20m, numerous wrecks, and anemones in a vast array of colours.
