After opening the gate leading from the TEMPLE OF POSEIDON back to the COASTAL RUINS, as shown in the previous section, you emerge on some steps above the tide pool (marked C on the map of the ruins).

To get back to ALEXANDRIA from here, jump in the water and swim around the right side of the rock formation directly ahead.

This channel leads back around to the left, toward the building with the ramp (B on the map).

Climb out of the pool where the rocks form a flat shelf just below the water's surface.

Head up the rocks toward the ramp. Then climb up on the left, opposite the ramp.

Follow the wall of the building around to the right...

...and jump up onto the sandy ledge (A on the map).

Go through the archway into the building, turn left, and continue up the stairs.

Head for the left side of the drop-off. Turn around and climb down the ladder...

...to the floor. Then climb into the crawlspace to the left of the ladder and crawl through to the other side.

Crawl backwards toward the edge then drop into the pool below.

Swim to the other side and climb out into the doorway. Head up the stairs to the left...

...to emerge at the end of the STREET WITH PALM TREES. Run all the way to the end of the street, turn left, and follow the twisting passageway back to ALEXANDRIA.

Refer to the last section in that walkthrough, REVISITING ALEXANDRIA to get back to JEAN-YVES'S STUDY. Then, when you're finished, retrace this same route to get back to the COASTAL RUINS. (Refer to these screenshots from the first time through this area if necessary.)

This time, instead of entering the CATACOMBS, as you did earlier, climb the dunes and head to the southeast.

The entrance to the TEMPLE OF POSEIDON is on the north side of this building, just above water level (C on the map of the ruins). Dive into the water and climb out there.

Return through the gate and down the ladder. Then follow the dark passageway back to the last room in the TEMPLE OF POSEIDON.

[Temple of Poseidon Walkthrough]