NUCLEAR
It is not as if the Spanish do not receive nuclear powered warships in their own territory. They do. In the joint Naval Station with the US at Rota, for example, less than two hours away from Gibraltar. The rationale for objecting to submarines calling at Gibraltar would appear to be nothing short of pure self-interest. The hope in Madrid is that by chipping away at the important military functions of Gibraltar, they will undermine the UK presence and sovereignty as well.
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14-06-23 PANORAMAdailyGIBRALTAR