6. No person who is wearing or equipped with clothing or apparatus designed or adapted for swimming under water or diving shall swim under water or dive within—
(a)100 metres of the walls, slipways, or boundaries of Her Majesty’s Dockyards or other Crown Establishments;
(b)150 metres of any of Her Majesty’s vessels;
(c)125 metres of either side of the recommended tracks for vessels leading through Plymouth Sound to the Hamoaze shown on current Admiralty charts;
(d)the fairways of the Dockyard Port; or
(e)any area where anchorage is prohibited under regulation 22,
save with the permission of the Queen’s Harbour Master.