Gondola Transport - Another Perilous Descent - Part 1

Slide down the zip line and when you see the on-screen prompt, press Dodge/Roll (Shift/Circle/B) to drop...

...and grab the perpendicular line below.

Keep sliding until you approach a third zip line. This time you don't get a prompt.

When you do let go, momentum will continue to carry Lara forward a bit as she falls. So drop a little before you reach the other line to ensure that she's able to catch it with her axe. The screenshot above shows the point where I press press Dodge/Roll.

Lara falls...

...and catches the line with her axe. Then she starts to slide down to the left.

Now you need to drop off the line before Lara smashes into the sharp metal on the roof of the tunnel. Wait until she's just above the green metal panel at the tunnel entrance and then let go.

Again, momentum will carry her forward a bit as she falls, but as long as you don't drop too late, she should land in the tunnel.