After swimming through the flooded passageway from the MASONIC TEMPLE, climb out of the water onto the low, concrete ledge.

Then pull up onto the ledge above.

There's a doorway above this ledge, but you don't need to go there now. Instead turn around to face away from this doorway, hop back...

...then take a running jump to grab the sloping shelf on the other side of the room.

Pull up onto the shelf, crawl through to the right, back up to the edge, and drop onto the ledge with the railing.

Turn around, pull up onto the higher ledge, and step to the right corner; i.e., the one closest to the crawlspace at the top of the wall, which is marked with an X in the screenshot above.

Take a standing jump from the corner to grab the ceiling grate. Monkey swing forward as far as you can. Then drop and grab the edge of the crawlspace.

Pull up and crawl through.

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