Selsey East Beach is a shallow Sussex shore dive used for snorkelling, freediving and easy scuba, where the beach can also serve as the start of a drift along the shoreline toward the lifeboat station. The underwater route is more about low-relief seabed, weed growth and small fish life than dramatic terrain, so the planning value comes from timing the water well and knowing where the beach drift line will carry you. This is not a difficult deep site, but ebb flow around high water and boat traffic near the wooden ramp mean an SMB and careful entry-exit planning matter more than depth.