Level 19. Water Torture (2)

In the bedroom with the vacuum cleaner, shoot the rank by the window to flood the chamber. Once underwater, a door between the second and third bed will open. Enter to find a nuke. Float up, shoot the two air vents, and collect the items within.

In the room featuring two columns on a light red platform, interact with the light switch to turn on the light. This action will cause a column to sink, revealing a rail gun.

After using the laser tank to destroy the metal door and create a hole in the far wall, proceed all the way up and outside to the area where the submarine circles the island. Consult your map (minimap (the small circular map in the bottom-left corner of your screen)) and navigate to the northwest pillar or chimney, facing it. Descend and enter the hole in the wall to find a guardian head.

Upon acquiring the yellow key, proceed to the yellow key lift and descend. Exit the lift and send it back up. A panel to the east will then open, granting access to items inside.

After obtaining the blue pass key, go to the blue corridor. In the northeast corner, a panel can be opened to reveal items.

Check behind the end level switch to find a heat seeker card.