
Once the shark (1) you met at the beginning goes belly-up, retrieve any remaining pickups: 3 bunches of harpoons (2-4) lined up on the bottom near the starting point...

...2 bunches of harpoons (5-6) in the deeper area strewn with crates and barrels...

...and the loaded HARPOON GUN (7) on the box in the corner.
NOTES: If you find all four hidden weapons in this level, you'll unlock the "Capitalist Accumulation" achievement/trophy. The HARPOON GUN is the first. Also, the dramatic music may restart several times as you explore, but there's only one shark.

The first secret is in an underwater tunnel in the far left corner of the pool (i.e., left when Lara's back is toward the wide cave opening). If you're having trouble locating it, begin by treading water with the cave behind Lara. Swim forward along the left side of the pool.

Dive down and swim straight ahead, through an icy tunnel with rusted barrels at the end.

As you emerge from that tunnel, make a U-turn to the left...

...into a small, rectangular opening in the ice wall. Inside is SECRET #1, the gold coins (8). Grab the treasure and return to the surface.
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