Face the wall on the right, so the boulder is on Lara's left. Adjust her position so she's flat against the wall (as shown above). Side flip to the left toward the boulder.
You may have to adjust Lara's angle and repeat the side jump several times but eventually Lara will squeeze between the boulder and the wall. Continue to side flip to the left until she reaches the corner behind the boulder.
Turn to face the wooden crate. Use the Look button to make sure Lara is flat against the crate and facing it squarely. Then side flip to the left again as many times as it takes to work her into the space between the crate and the boulder.
Now you should be able to push the crate into the room behind it and access secret #2.
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