Diving Area - Control Room and Room Below the Helipad
In the last section, we used the switch in the room with the DEEP POOL AND MINI-SUBMARINE to open a door in the ROOM WITH THE CIRCULAR SAW, then made our way back there. Climb the stairs to the control room.
Inside, use the switch to move the hook with the suspended block.
Return to the edge of the pool and take a standing jump to grab the dangling block. Pull up.
Then take a running jump from the block down to the other side of the pool. Take care not to run into the deadly spinning blade.
Notice the RED PASS CARD near the saw. You're missing the MACHINE CHIP that turns off the saw so you can reach the card. Have patience. For now, climb onto the crates in the corner and drop down behind them.
BUG NOTE: A potential bug prevents one of the upcoming enemies from spawning correctly, so you can't get the Uzi ammo he drops. Save the game before pressing the next button. Then if this happens, you can reload and try again. There are a few other possible fixes in a note following the main walkthrough.
Press the button...
...to raise a platform back at the HELIPAD revealing a previously hidden area below.
If you see an enemy in this brief cutscene, it probably means the bug has not been triggered, but I still recommend keeping a save before the button until you're sure.
Climb back over the crates, swim across the pool, and exit through the doorway on the left, which leads back to the LARGE SQUARE HALLWAY. There are 2 armed men (26-27) and 2 dogs (28-29) between here and the HELIPAD. Depending on RNG and how fast you move, you may encounter them at various points along the route, so be ready.
If you go quickly, you'll probably meet the first dog and a man with a shotgun as you enter the SQUARE HALLWAY. They approach from the left.
The human drops shotgun ammo (27). Continue around the next corner to the stairs leading up to the HELIPAD.
NOTE: If you don't already have the SHOTGUN, you'll get it here instead of ammo.
If the second dog still hasn't appeared, wait outside the stairway for it to emerge, so it doesn't corner you.
Continue up the stairs. You may meet the second armed man on your way up.
If not, he'll probably be lurking in the large, square depression below the platform you just raised. (If he's nowhere to be found, check the bug notes.)
He drops Uzi ammo (28).
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