tokens: Solid jetties , moreover , lined with quay walls , are sometimes carried out into a wide dock , at right angles to the line of quays at the side , to enlarge the accommodation ; and they also serve , when extended on a large scale from the coast of a tideless sea under shelter of an outlying breakwater , to form the basins in which vessels lie when discharging and taking in cargoes in such a port as Marseille .