This will tell you were to go to get an extra breath on tomb raider 2...40 foths chapter. Also in the chapter before it enters the step 1 cheat code to unlock every weapon fully loaded.

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[edit] Steps

Hold R2 press left right left release hold R1 press down up release turn completely around 3 times back flip press O in air to face the opposite side. You should here a rifle load, if entered in correctly.
Swim/follow the tanks dumped in the water, keep following.
Look for a sunk ship. Swim to the anchor look down you will see a tunnel swim threw it you'll be in a huge room place.
Swim up until Lara caches breath. You're out of some water breathing.
Kill the sharks.
Press select and choose the harpoon gun. Wait until a shark comes shoot it. Then another comes shoot it.

[edit] Tips

Use health packs to keep you alive from the sharks.
If you put this game in a CD player, you can hear chapters and voices from the game.
The cheat will give you 50 large life packs.