
You had better find some air and fast! As soon as you regain control, roll...

...to face away from the damaged sub. Swim forward, veering a little to the left.

Then follow the trail of junk on the seafloor toward a sunken ship.

The path is much easier to see with classic graphics (F1 on keyboard, Options button on PS4/5, Menu button on Xbox, Plus [+] on Switch).

A great white shark (1) appears ahead on the right. Ignore it and continue following the debris toward the left end of the wreck. (The main walkthrough includes a note about the "No Fish Soup Today" achievement/trophy: no damage to or from sharks.)

Swim to the top of the overturned hull.

Here's the same view with classic graphics. Less realistic but also less murky.

Just behind the rusted anchor is an opening. Swim inside...

...straight down a short, vertical tunnel, then forward...

...and up to the surface in a room with a pocket of trapped air. The first shark (1) will follow, along with a second shark (2) not far behind. If you don't care about achievements, you can wait in this room and harpoon the sharks as they come in. Otherwise, take a breath and and get moving: Swim though the large opening on the right (i.e., right if Lara's back is to the tunnel where she came in).

In the next room, turn right.

Then head for the opening on the far side of the room, in the top left corner. Swim through.

The next room has a low, curved ceiling. Head for the square opening in the far left corner.

The next room is almost a mirror image of the previous one, with the curved hull forming the ceiling. As you enter, make a sharp left. Swim forward, staying close to the left wall. There's a lever on this wall in the far left corner, just above the floor. Use it to open a trapdoor in the floor.

Roll and swim forward then down through the trapdoor. (As far as I know, the sharks won't follow Lara beyond this point.)

In the room below the trapdoor, turn left.

Swim across the bottom of the room and turn left, the only other way out.

There's a square hole in the ceiling just ahead. Swim through and surface in a room with air to breathe...

...and several floating crates where you can climb out of the water.
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