"Sneak into the other room" is a mission objective in Sequence 13 / Memory 04: Raising the Dead
Walkthrough[edit]
Climb out of the Southern room and make your way over to the right. Slip past the Raiders that are still in the main room. Head over to where you entered for an easy time to get over to the Northern part. Just watch the Raiders nearby and use a Cherry Bomb to distract them for that short time needed to get over and down into the Northern Room.