The bottom of the channel is paved with solid granite slabs, the walls are built of rough stone, and seams sealed with lead. All of this was built exceedingly strong. In the late 1850s was decided to do the reconstruction and expand the entrance of the dock for the new battleships, the old masonry of Elizabethan times only dynamite could demolished. Builder of the dock von Lyuberas was a very good engineer whatever.
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