Before revision: Submerged buoys In deeper waters, areas covered by sea ice, areas within or near shipping lines or areas that are prone to theft or vandalism, moorings are often completely submerged with no surface markers.
After revision: Syntactic foam sphere used as a subsurface floatSubmerged buoys In deeper waters, areas covered by sea ice, areas within or near shipping lines or areas that are prone to theft or vandalism, moorings are often completely submerged with no surface markers.