(I think this works under any difficulty setting) After you meet Stillman and he tells you how to freeze the bombs, go and freeze the bomb in the woman's restroom, then Stillman will automatically call you (you can skip the transmission if you want) then call Pliskin (Snake-141.80) NOTE: DO NOT skip the transmission! This code will not work if you do! Then go outside to the CD Connecting bridge. You'll notice that the guard will be knocked out and there will be a man walking across the bridge in a cardboard box dressed like the soldiers sent in to take out DEAD CELL (it's snake!) NOTE: Also in the skit were Raiden meets Olga she'll Snake sneaking around inside a cardboard box.