HOW BRITISH SHIPS ARE GUARDED WHILST IN PORT. SEPTEMBER 1940, PLYMOUTH. BOOM DEFENCE ORGANISATION WHICH GUARDS THE ENTRANCE TO PORTS. THE BOOM DEFENCES CONSIST OF NET OBSTRUCTIONS REINFORCED BY EXPLOSIVES WHICH ARE STRETCHED ACROSS THE ENTRANCES TO HARBOURS WITH SPECIAL ARRANGEMENTS TO PERMIT THE PASSAGE OF FRIENDLY SHIPPING. GUARD SHIPS ARE PROVIDED IN THE BOOMS TO GUIDE THE SHIPPING AND PREVENT UNAUTHORIZED ENTRY. - Two of the crew of a gate ship watching for the relief ship

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