One of the biggest problems with dead ends is that you usually can never be really sure you are in one unless you cunsult a walkthrough. If you really want, you can create an endgame there, telling the player that he is locked out (or in?) forever, but not expect him to understand on himself that he is in a dead end and not just missing something that will allow him to continue.
Generally, I think you shouldn't be punishing the player for not behaving like you wanted him to, I found myself annoyed by these sort of things in a game.
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