Digue de Socoa is a shore-access breakwater dive on the bay side of Saint-Jean-de-Luz, with rocky structure, shallow drop-offs, and an easy local entry that suits relaxed exploration or training. It is best approached on calmer sea states, when the sheltered water makes the route simple and the close-in features easier to read. Plan for a temperate-water site where tide, swell, and visibility still matter even though the entry itself is straightforward.