Lyness was the base for the Atlantic and Home Fleets during two world wars, and a great many ships have lain at anchor in Gutter Sound.  Sailors then, were much the same as today, and any unwanted rubbish or broken equipment would be thrown overboard.  What was rubbish then, can be treasure to today’s divers.  The silty bottom of Gutter Sound can produce a variety of old bottles, plates, cups, shell cases, ginger beer bottles, shaving cream pots and more.  Much of it is often thrown back for the next diver, but the odd prized item can be found.  Gutter Sound has an average depth of 18 metres.