Swim to the other end of the lagoon near the bamboo hut and the fat palm tree. In the middle of this section of the pool, there's a gray stone outcropping with a small medi pack on top.
Swim around to the right side of of the rock, where one corner is low enough to reach.
Pull up and take the health pack. Then look out across the water to spot a secret. Across the pool you'll see a series of flat blocks just above water level. It's hard to see in the screenshot, but in the game you will notice some MP5 ammo sitting on the rightmost block. The leftmost block has a steeply angled block connected to it. Take a running jump from the peak of the rock where Lara is now standing to grab the angled block.
Traverse to the right, and pull up onto the flat ledge.
Turn right, step to the outer corner of this block, and take a standing jump to the next flat block ahead. The chime will sound for SECRET #1...
...but you'll need to take a running jump to grab the next ledge and then pull up to get the ammo.
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