The early World War Two modifications of HMS Hood, resulted in Hood's 'boat deck' (also called her 'shelter deck') being outfitted with seven 4 inch 'twin barrelled' anti-aircraft guns:
This was something of an 'austere makeover' that aimed to increase Hood's anti-aircraft capabilities. To 'make space' for installing these guns, all of Hood's single barrelled 4 inch anti-aircraft and 5.5 inch naval guns 'were removed' - although facilities (such as their magazines and 'shell supply lines') were enhanced to support her new guns. These modifications were carried out 'more for speed' than for robustness reasons - as the entire 'boat deck' could really be considered as a target for incoming shells! This issue was further compounded, by the fact that 'ready use' ammunition lockers were installed 'next to and near' each anti-aircraft gun mount. During the Battle of the Denmark Strait, a boat deck fire 'wreaked havoc' amongst the ammunition that was stored in these.
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