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Cadiz explosion
A point to note for the explosion cause: The museum (In the Santa Catalina fortress) exhibition on the explosion, which contains a model of the explosion site, tells the tale that the days before the explosion had been unusually hot. Surveyors traced the explosion point to a location in the arsenal where a mass of German WBD mines had been stored. The theory was that while 'normal' Spanish explosive was temperature-stable, the German WBD mine was loaded with nitro-cellulose (Gun cotton), which was definitely NOT temperature-stable. This was evidenced by a copy of a general letter to the Spanish Navy soon after, stating that any weapon they had which did NOT contain one of the 'approved' Spanish explosives was to be offloaded as soon as possible.