Secret one
At the wooden bridge, climb the righthand frame:

Look right, at the rock wall - there's a cobweb covered passage:

Jump over to the passage and go through to find a secret room:
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Secret two
Just before the end of the level, you'll see this barrel standing in the corner:
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Shoot the barrel. It explodes, opening a gap in the wall:
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Crawl through the wall into a secret chamber:

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