Cheats for Tomb Raider: Underworld

Bullet Proof Lara	Hold L2. X, R2, Triangle, R2, Square, L1
One Shot Kills	Hold L2. Triangle, X, Triangle, Square, L1, Circle
Shows Enemys Health	Hold L2. Square, Circle, X, L1, R2, Triangle

Laras Bathing Suit	Complete the game on any dificulty setting and this becoms unlocked in treasure Hunt mode when you revisit the Mediterranean Sea Expedition.
Treasure Hunt Mode	Complete the game on any difficulty to unlock Treasure Hunt mode which allows you to revisit all levels to claim treasures/relics missed through storm

Invincibility.	(Hold LT) A, RT, Y, RT, X, LB
Level Clear (You have to enter the code every time you want to do this)	(Hold LT) Y, L (push L stick down), B, RB, X
Nuclear Wave (To use: Press LB wile holding RT to emit)	(Hold LT) X, Y, RB, A, B, LB, X
One shot kill.	(Hold LT) Y, A, Y, X, LB, B
Show enemy health numerically.	(Hold LT) X, B, A, LB, RT, Y
Stage Section Clear (You have to enter the code every time you want to do this)	(Hold LT) RB, Y, A, A, B, RB
Swim Dart (To use: Swim and do what you would normally to swim faster)	(Hold LT) A, RB, LB, RT, X, Y