Stand facing the low tower surrounded by razor wire-topped fence, with the gate separating this area and the previous one on Lara's left. From a safe distance, use pistols to shoot the fuel barrel through the small hole in the fence.
When it explodes, it destroys a big section of the fence so you can get in. If the explosion doesn't shatter the wooden crate containing the silver reward (1/3), use pistols with manual aim to shoot it.
Alternatively, go around to the side of the enclosure near the INFIRMARY (the building with the green cross near the machine gun).
Shoot the rickety wooden crates alongside the fence to reveal an opening.
Go through. Then, either blow up the fuel barrel or just use manual aim to break the wooden box with the reward inside.
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