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Diego Garcia also strengthens Britain’s economic security. Over one-third of the world’s bulk cargo traffic and two-thirds of global oil shipments are transported through the Indian Ocean. Our constant presence in these waters serves to safeguard trade routes, keeping down the price of food and energy for Britons here at home. Diego Garcia is also the permanent location of critical Comprehensive Nuclear Test-Ban Treaty monitoring equipment—a network that watches every moment of every day for evidence of nuclear testing, to hold nuclear and would-be nuclear powers to account. Diego Garcia is one of just four locations in the world to operate ground station antennae for the global positioning system, which everyone from astronauts to motorists and our military rely on to navigate.