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reporter: a nuclear-powered u.s. navy guided missile submarine. 160 crew onboard. but they call it the silent service for a reason. that s right. reporter: they deploy underwater for up to 120 days. several months at a time. we are given rare access as we board the submarine. thank you. rear admiral william houston describes where we re standing, just above the tomahawk missiles. this can lift up at any time? this could lift up at any time, on order, if we wanted to launch the tomahawk missiles. reporter: and how many tomahawks are we sort of standing on, right here? right now, seven. reporter: they have more than 100 tomahawks at the ready. and he points out something else. we won t go any further.acr . reporter: they are about to take us down into the submarine where we will spend the next 24 hours traveling with them. a maze of narrow hallways and hatches. hi, how are you? good to see you. ....