The barrier was initially completed in 1735 and over the years, the French continued to fortify the wall, piling huge boulders along its coastline to stop erosion from the waves pounding the harbor. At its highest, the barrier running along the water's edge reaches about above sea level. The boulders, some weighing up to a ton, are weathered black and brown. The sea wall is inspected every year and whenever gaps appear or the stones sink into the sand, the government adds more boulders to keep it strong.