 The cave dwellings of the early inhabitants of Provence were regularly flooded by the rising sea or left far from the sea and swept away by erosion.The changes in the sea level led to one of the most remarkable discoveries of signs of early man in Provence.In 1985, a diver named Henri Cosquer discovered the mouth of a submarine cave 37 metres below the surface of the Calanque de Morgiou near Marseille.