Just a disclaimer, and this may get bumped (I apologize if so) but this mission, the one after you take down your wanted posters, is somewhat confusing. It's not a glitch, since no event is missing or out of order, rather the dialogue tends to make you think that your friend will lead you to the underground entrance, when really you lead him to an area that is blocked by guards. Just scale a building (don't get on the roof) and your friend will walk right by the guards (the ones that push you away and warn you). Hope this helps.
This is good. becasue I thought the game was glitched since he said "its time you saw the tunnels" or something along those lines... waiting for him to show mw to the damn tunnels... then I just carried on to the green check marker and everything was fine.
I played and loved every second of METAL GEAR SOLID 4. Problem?