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DOOM 3: Resurrection of Evil Hints
How can I open the two storage lockers in the Specimen Research Lab?
1 of 4: They've magically changed locker numbers and combinations since you were here in the original game, haven't they?
2 of 4: There is a PDA lying around that has the code in an e-mail, but you may have missed it (especially if you were running from the hellknights in earlier rooms instead of killing them and then exploring carefully).
3 of 4: Patrick Hook's PDA, which is sitting on the counter in the little kitchen nook of the Common Area, has the code in it.