Where's the next-easiest one?
  • 1 of 6: Save your game, since this treasure chest is a bit trickier to get to without drawing any unwanted attention.
  • 2 of 6: From the east side of the ruined doorframe you went through to get to the first chest, crouch down and move forward until you fall into the water.
  • 3 of 6: Quickly head NW, not crouched but still underwater, until you reach the rubble that forms a ramp leading out of the water.
  • 4 of 6: Surface near there, but don't go on the ramp. There's a Fright nearby, and it may see you.
  • 5 of 6: Keep as far away from it as you can while moving past the rubble to find the underwater treasure chest that's at the far NW corner of the big watery crevice.
  • 6 of 6: Once your Disarm Trap guy opens it, save your game and then head carefully back the way you came.