After passing passing through the Cairo Museum, Sam has to rendezvous with Garrett at the extraction point located at the Ibn Tulun Mosque.
Fun level, definitely one of my favorites. This level contains the first real "arena" fights, whereas the previous two levels were just rather straight forward. From here, things begin to pick up, but the game truly hasn't even started yet.
Adult arachnoids are a bit dumb, aren't they?
Sixteen secrets in this segment:
1: 1:05 - 1:11 A little past the starting area where all the cloned soldiers are waiting, there is a bit of an "outpost" with sandbags, and a cloned soldier on top. Jump onto the nearby garbage dumpster, and jump onto the utility box against the wall, and from there jump onto the top of the wall and over the sandboxes "into" the building, where you'll find some secret shells.
2: 1:39 - 1:42 After finding the first secret and moving onto the next area with cloned soldiers, you'll find another dumpster that allows you to jump over the nearby wall. Do so, and you'll find some secret armor on top of a few boxes.
3: 2:19 - 2:26 After passing through the alley, you'll find yourself in the open street where you'll notice a ruined building that you can jump into. Jump onto the debris and make your way to the right portions where some secret health is placed.
4: 3:36 - 3:44 After passing under the overpass, to the left will be a wall where a Gnaar is waiting to ambush you. Once dealt with, some shotgun shells are on top of the crate against the wall, if you go to collect them and turn around, there will be a small pill bottle in a corner of the wall against the overpass to the right. A kleer will climb over the wall shortly after picking up the secret health bottle.
5: 4:22 - 4:25 Right before you pass into the alley that goes under the overpass are some planks boarding up a small room. Break the planks to get some secret electricity cells.
6: 4:38 4:41 Still before going under the underpass again, go along under the building to the right and you'll find some armor in another small room.
7: 4:43 - 4:49 In close proximity after secret six, still before going under the overpass to the next part, there is a small fenced alley with a ruined car, and garbage dumpster nearby. This area contains a bit of armor and health, but in the farthest corner after the ruined car is a single mini-secret armor shard. A kleer will spawn nearby after picking it up.
8: 5:40 Finally going under the overpass, once the nearby enemies are dealt with, take a right into a smaller alley past the nearby garages where you'll find another mini-secret; a spare shotgun, and some ammo.
9: 5:42 - 5:49 Right in front of you after secret eight is a dumpster, jump onto it, and over the nearby wall. Keep going forward to the stacked drums, and jump onto them, and over the next wall to perform some secret flanking.
10: 6:39 Once the dark area under the overpass with all the columns is safe, there is another barricade of planks blocking access to a room, break it to get some secret armor and shells.
11: 7:05 - 7:15 Once you see the adult arachnoid stroll past, walk up the stairs to the right until you see a break in the wall to your left. Look out from the hole, and you'll see some health leaning around the edge of the overpass. From the hole in the building, jump to the health along the thin ledge to where to get the secret.
12: 9:09 Before entering the residential area, to the left are some concrete barricades, in the farthest corner is a mini-secret bundle of rockets.
13: 11:06 After passing through the alley where a few kleers and kamikazes attack you, the next area nearby has some crates against a wall, using the crates, jump over the wall and on the ground on the other side is a secret assault rifle.
14: 11:24 - 12:32 Keep progressing, and you'll come to a wall with a couch under a sign. Directly left is a chair and drum. Jump onto the drum facing the wall, and you'll be looking into a hole that has a small switch in plain sight. Shoot it, and you'll unlock a secret door. Keep going after that, and in the next area before venturing to the stairs leading to the mosque entrance is a large pile of boxes. Break the boxes to reveal a secret speedrun shortcut that was opened from shooting the switch earlier.
15: 17:33 After passing along the outer mosque, there is a large pile of boxes. Between the boxes is some secret armor that you can just jump over between the area to collect.
16: 19:38 - 19:50 In the main area of the mosque is some small scaffolding that you need to go up, and crouch through, it can be a bit tricky nudging through. Once you get to the top of the scaffold, make your way as close to the edge of the nearby structure, and jump up to collect some secret armor. Beware, if enemies are shooting you near the scaffold, it's possible for them to break the plank, and deny you access from getting this secret. So be as quick as possible to get this secret.