Tomb Raider: The last Revelation
Alexandria
LEVEL 18: HALL OF DEMETRIUS
(NOTE: Technically, this secret is found in the COASTAL RUINS level, but since it is only accessible through this level, it is included here.)
Follow the hall to a LARGE ROOM WITH BALCONIES AND PAINTINGS. Go up the ramp on the right (south) side of the room and up the ramp. Take the PHAROS KNOT from the pedestal. Return down the ramp to the main room. Cross to the opposite (north) side and go up that ramp.
Cut scene: Lara looks around, perhaps sensing that she's not alone. Then she begins to read one of the scrolls she finds. She is interrupted by Von Croy and some of his men. (A transcript of the dialogue appears below.) As the assassins follow Lara, Von Croy escapes through a secret panel in the wall.
Kill the 3 assassins. They come down the hallway directly in front of Lara's starting position at the end of the cut scene, so you can use a single grenade to take them out quite easily. Go back up this ramp to the room in the cut scene. Drag the lantern along the scrape marks on the floor to open the concealed door where Von Croy exited.
(NOTE: Before exiting, make sure you have the PHAROS PILLAR and PHAROS KNOT artifacts. The former is found in the previous level, THE LOST LIBRARY. The latter is found in this level.)
Go through the secret door and slide down the ramp to splash down in a small pool back at the COASTAL RUINS level. The chime sounds for secret #1 (53/70). Climb out of the water and pick up a large med-pack and poison arrows in two corners of the room. Pick up the BROKEN GLASSES on the platform as well. Inside the opening above the platform is a ladder. Jump up to grab it and climb to the top. Follow the hall to emerge at one of the buildings near the tide pool.
TO PHAROS, TEMPLE OF ISIS: If you have the PHAROS PILLAR and PHAROS KNOT (which you should if you've followed this walkthrough), head for the next level. Go down the beach, wade into the water past the L-shaped stone wall, and dive down. Swim through the underwater passage to the right (south) to enter PHAROS, TEMPLE OF ISIS.