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 and take a running jump from the block down to the area on the other side of the pool. Just take care not to run on into the deadly spinning blade.
Note the RED PASS CARD near the saw. You'll need this, but part of the circuitry that turns off the saw is missing. Have patience. For now, climb onto the crates in the corner and drop down behind them.
Follow the short passage to a button and press it.
This raises a platform in the HELIPAD area, revealing a previously concealed area below.
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