Just above the dock outside the room with the switch, there's a glassed-in walkway. You can glimpse the secret through one of the windows.
Stand below the walkway and jump straight up to grab the edge. If Lara doesn't grab it at first, just hold Action + Jump and she'll gradually hop her way forward until she's able to grab.
Pull up and shoot out the window. Enter and take SECRET #3, the Jade Dragon (plus 4 sets of automatic pistol clips if you also found the other two secrets).
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