After destroying the flying mutant (4), as shown in the previous section, Lara is standing on the low step overlooking the lava pit. There's another mutant (5) in the cave on the far (west) side of the lava pit, but it's difficult to target it from this distance. You'll have a better angle later, but if you want to take care of it now, climb onto the raised block to the left of the low step, then jump over to the slope on the left side of the pit.
Shoot the mutant from there, sidestepping left and right to avoid its projectiles. Then return to the low step and go after the secret.
Step carefully off the edge or hang and drop onto the flat corner block in the lava pit where the flying mutant came from.
Move to the outer corner of the block and take a standing jump across the lava to the next safe block.
Step carefully off the edge or hang and drop onto the ledge below.
Position Lara at the outer corner of this block and angle her toward the block in the opposite corner of the cave, where there's a large medi pack (8).
Hop back and then take a running jump to grab the front edge of the block.
Pull up and take the medi pack, which is this level's only SECRET.
If you've found all the other secrets in Atlantis, you'll unlock the "Codex of Hive" achievement/trophy when the secret chime sounds.
To get back out, retrace your steps: First, turn around, move to the outer corner of the block where the medi pack was, and angle Lara toward the block you just came from. Hop back.
Then take a running jump to grab the front edge of the block.
Pull up. Climb back onto the ledge above.
Now take a running jump across the lava to grab the edge of the block where you first dropped down. Pull up.
And finally, pull up onto the low step at the rim of the pit.
If you managed all this without landing on either of the slopes, you'll unlock the "I See Goals, I Don't See Obstacles" achievement/trophy.
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