The lost laboratory is located behind the Prometheus monument, to the right of Puzzle 4.
The entrance to the lost lab.
Tetromino Bridge
The Western Delta features a single 8-piece Tetromino Bridge. It starts off enclosed between walls, and the second part opens up, allowing the bridge to cross the river below.
Location 3: Between Puzzle 5 and Puzzle 6, next to a data terminal.
Location 4: On the rails of the rapid transport system. See next picture for how to reach this.
How to reach Location 4: Climb on to the rails here. Walk and jump, don't sprint.
Location 5: Just outside the Prometheus monument.
Quote
You must yearn for a better world, yearn for it with such intensity that your heart suffers; keep your eyes on
that distant vision even when you know that you may never reach it.
—Prometheus
Sphinx Monument
The clue shown on the Sphinx monument.
Solution
[ solution ]
Go behind puzzle 6, you will find a set of stone pillars on the ground. Push the ones indicated by the clue to activate the monument
Location of the pillars. Puzzle 6 can be seen in the distance
Quote
None may know what came first, error or sin; and yet every choice depends on it.