This sequence was discovered by über-raider Jeff Reid. It requires the rocket or grenade launcher and a little patience, but it's actually much quicker than the more elaborate strategy described above. The same sequence shown in the screenshots below is also included in the video walkthrough.

Start by following the strategy shown in part 1, just to the point where you swim into the room with the guard and frogman.

Then, instead of heading to the right toward secret #5, turn left...

...follow the straight channel with the metal sides to the end...

...and climb out on the ledge to the right.

Turn around and jump across the water to the corner ledge. Turn left and jump over the slope onto the white rocks behind the frogman.

Pick up the harpoons now if you like or return for them later.

Grab the right side of the ledge on which the frogman is crouching but don't pull up right away.

Instead, while holding Action, press and hold Duck to pull up directly into a crouching position. The frogman will take no notice of Lara, and as long as she remains crouched, the guard can't see her either.

Continue holding Crouch as you press Look and use the direction buttons to scope out the guard. Watch him carefully and you'll see his head turn back and forth.

When he looks away, as shown in the circular inset above...

...quickly stand up, draw the rocket or grenade launcher, and blast him. You need to be fast or he'll sound the alarm. Then you won't be able to get the secret in the room with the UPV. If he does set off the alarm, reload your save from before pulling the lever and try again.

Once the guard is dead, the frogman will just continue to sit there. You can't shoot him, so you'll be short one kill for the level, but don't touch him or Lara will die. You should now have no trouble getting the secret in the underwater room, as long as you don't save and reload beforehand.

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