After you open the gold sarcophagus --
How do I open this new sarcophagus?
-- someone will appear behind you to ask what you're doing. After you have a leetle conversation --
-- down comes the ceiling, trapping the person. You can't help the way you did when the ceiling caved in on Dylan, so let's go look for another way out.
The passage from the gold sarcophagus to the first burial chamber is now blocked off, but that's not our only passageway anymore. Go out tunnel 4 to tunnel 2 and then to the main room --
-- and you'll find that the main exit from the tomb is also blocked! Now what?
Wait a minute, didn't the journal say something about a second exit? Maybe Jamila knows something about that.
Go down tunnel 3 and talk to Jamila. She'll give you a signal box (to call for help), a key, and a piece of paper with a riddle on it.
How do I use the signal box?
How do I use Jamila's info to leave the tomb?