The Tachikoma units, through the use of a satellite, have spotted an American Empire ballistic missile submarine carrying nuclear warheads off the coast of Okinawa. The discovery has the Tachikoma tanks concerned; they cannot hack into the submarine's computerized equipment to determine the vessel's orders, and to make matters worse, the missiles carried by the submarine are designed to go clear into the stratosphere before returning to earth. This revelation means the submarine can hit Dejima Island from its current location and position and that the missile cannot be traced back to the submarine, thereby absolving the American Empire from any blame for a nuclear attack...