Obelisk of Khamoon - Through the Door Beneath the Obelisk
Once you've claimed all 4 ARTIFACTS, the exit below the OBELISK opens. Drop into the pool. Top up Lara's air, then swim through the door, which is just below the ANKH BRIDGE.
Swim down the vertical tunnel...
...to the bottom, then forward.
Ahead is a long passage with alcoves along both sides. A few of these alcoves contain goodies, but if you're going for achievements/trophies, do not pick up any of the next 6 items on the bottom yet. Just continue straight ahead.
At the end of the tunnel, turn right...
...and continue forward to the next bend. Turn upward here.
At the top of this vertical tunnel, head to the right...
...and upward into a pool where you can surface.
Again, wait to pick up the items on the bottom of the pool, and take care of the mummy (15) roaming around above. You may be able to climb out of the water on the opposite side of the pool from the mummy and shoot as it approaches.
- OR -
If the mummy is too aggressive, try swimming to the edge opposite the raised alcove and treading water there for a little while. The mummy should come around toward you. When it does, swim quickly underwater to the opposite edge, climb out, run to the raised alcove, and pull up.
Then you can kill the mummy from safety. Pick up the 2 sets of magnum clips (35-36) here in the alcove. (There's also a save crystal in NG+.)
DARK MODE: Even with brightness adjusted, dark images on a light background can be hard to see. May I suggest a reputable dark mode browser extension, such as Dark Reader? (Download only from trusted sites, like darkreader.org or your browser's web store.)
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