This new tunnel (which is now on your map as tunnel 5) has a number of interesting things to find in it.
Take one step in and look down into the sand to see --
-- footprints, a rhinestone, and an interesting item --
-- that looks like half a piece of plastic with numbers on it. Can you guess where it goes? Well, hold onto it for now, because you can't do anything with it until you find the other half.
Go forward another four steps to an open area with pillars and pick up the last journal pages from the sand at the right. What a sad story.
Yes, but if she died here, where's her body?
Continue forward till you come to another hand panel; click on it to find yourself once again in tunnel 2.