Forum:Need help in neptunes bounty

When you're on your way back from jet postal I get stuck in the room just after the waterfilled hallway.. if I go back to see if I missed anything I encounter some respawned splicers, but nothing else. I'm pretty sure I've been everywhere. But the fucking Gate won't open. Once and again I get a new Big daddy on the other side, I kill him, but nothing..

anyone else had this problem? some tips on how to get past it?? THX, Terasoul