Since 1969, the United Kingdom always has always had one submarine armed with nuclear-tipped ballistic missiles underwater, undetected, in constant communication, ready at a set notice to fire at targets anywhere in the world. This is part of its Trident Programme, which includes the development, procurement, and operation of the current generation of British nuclear weapons, as well as the means to deliver them. Operated by the Royal Navy and based at Clyde Naval Base on Scotland's west coast,