 This Explosive Handling Jetty is one of the world's largest floating concrete structures.The UK's Polaris system was fully serviced at Coulport, but the Trident missiles are randomly selected from the large US stockpile at the Trident Refit Facility at the Naval Submarine Base Kings Bay, Georgia.The missiles are not owned outright by the UK, which has "mingled asset" ownership rights to 58 missiles from a pool shared with the US Navy.