
After destroying the cyborg, as shown in the previous section, you can see the KEY BIT lying on the electrified floor, but you can't reach it yet. Shooting the valve earlier also opened the vent high on the opposite side of the room from the entrance. That's where you're headed next.

Start by stepping off the right edge of the duct opening to land on the metal crate once more. Pick up the HK ammo (14) (232/239) if you didn't get it before.

Position Lara on top of the crate facing the outer corner of the lowest of the three sloping, metal ducts. Walk to the corner of the crate. Adjust your angle if necessary. Then hop back.

Take a running jump from the crate to the duct. Do not press Action but continue to hold Jump during the entire sequence. If you've set it up correctly, Lara will land on the sloping top of the first duct (1), backflip off it and land on the sloping part of second duct (2), immediately jump forward onto the third (3), then backflip once more to land on the flat top of the second duct (4). No need to turn, grab, or slide.

If you do it right, Lara ends up here.
- OR -

Alternatively, you can take a small shortcut to avoid the complicated jumps. Start by standing in the middle of the crate, squarely facing the second highest duct. Walk to the edge.

Pivot a little to the left to face the black grate just to the right of the open duct where you came in. (The gushing pipe is below this grate.) Use the Look button to check the angle and adjust if necessary.

Hop back once.

Then take a running jump onto the grate. Do not press Action or Lara will fall short and be killed. You can tap Left in the air to pivot slightly toward the grate, but if you set up carefully, this won't be necessary.

Lara should end up here.
This short video shows both jumps. It was made in the classic game, but the moves still work.

Pick up the grappling gun ammo (15) (233/239) at the back of the black grate. Climb on top of the open duct.

Equip the GRAPPLING GUN and shoot a hook into the grate on the ceiling.

Again, the reticle will flash green when you sight the right spot.

Walk to the front edge of the duct, hop back once, then take a standing jump to grab the rope.

Slide to the bottom of the rope. Swing back and forth.

Then, on the forward swing, jump off the rope, pressing Action to land in the duct (or grab the edge and pull up). Go to the back of the alcove and use the switch to shut off the water and drain the room below.

Take a running jump from the opening past the dangling rope to the top of the duct where you came in.

Pick up another grappling hook (not counted), which has mysteriously appeared on the black grate. Then drop to the floor.

Take the large medipack (16) (234/239) and the KEY BIT (LEFT) (17) (235/239) the cyborg dropped.
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