With a staccato burst, a horn sounded in the control room of the HMS Vanguard, sending the crew of the nuclear-armed Royal Navy submarine to battle stations. The voice of the commanding officer crackled over the intercom. "Set condition 1SQ,” he said, ordering its battery of ballistic missiles to be readied for launch.
It was just a drill, conducted last Monday for a visiting VIP, British Prime Minister Keir Starmer. But Starmer had reason to pay close attention when he was shown where the submarine’s launch key is stored: The prime minister is the only person in the United Kingdom authorized to order a nuclear strike.
"You’re looking for the ideal conditions?” Starmer asked softly, as the captain explained how the Vanguard must be maneuvered to the right depth to launch its Trident missiles. Starmer leaned forward in the captain’s chair, the blue glow from a bank of screens reflected in his eyeglasses.
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