After retrieving the HAND OF SIRIUS and climbing up to the alcove in the southwest corner of the OCTAGONAL ROOM, as described in part 2, continue as shown here:
Inside the alcove, walk forward to the edge of a deep shaft. Take a standing jump to grab the climbable wall ahead.
Climb down to the bottom. (To descend ladders faster, repeatedly release and re-press Action to let go and grab, let go and grab, etc.)
At the bottom of the ladder, roll and move into a SMALL ROOM WITH A CHAIN AND MUMMIES. The 2 mummies don't animate yet.
Stand next to the chain, facing the alcove with the closed gate and one of the sleeping mummies. Now press Action to pull the chain
A cutscene shows the OCTAGONAL ROOM rotating again. In the process, some of the spikes retract, leaving the SCARAB TALISMAN unprotected in its alcove.
After the cutscene, you'll notice the gate in front of you has opened and the mummies are beginning to stir. Step around the chain and run forward, jumping over the mummy as it arises. Grab onto the ladder on the back wall of the alcove and climb to escape from the mummies.
At the top of the ladder, you emerge on another ledge in the OCTAGONAL ROOM. Turn left.
Take a running jump over the slope to the flat ledge beyond. Climb onto the next ledge...
...and place the HAND OF SIRIUS in the receptacle to lower a rope from the ceiling behind you.
NOTE: If you missed secret #5 earlier, you can retrieve it now. Then return to this point and continue. See the footnote at the end of the main walkthrough for details.
Walk to the corner of the ledge nearest the rope. (The HAND OF SIRIUS receptacle will now be behind Lara on the left.) Then take a standing jump to grab the rope.
While holding onto the rope, rotate Lara to face the alcove with the TALISMAN.
Press Sprint/Dash to start the rope swinging.
Then jump to land on the ledge in front of the alcove.
Take the SCARAB TALISMAN from the pedestal.
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