As designers go to enormous lengths to make subs as quiet as possible it seems a bit odd that you'd fire off a couple of SAM's and broadcast your exact position to the whole world
Unless you came up to take a peek (visible or radar - ye gods) you'd never be sure how many aircraft were up there and where they were - maybe listening woud give you an idea but you could very easily be horribly embarrassed if they were flyng in pairs............