To find Mya's holopuck in the Peru Facility (or Andes mountain) level, complete the first stage. You will automatically go to the second stage, where you will start on a bridge or some kind of a walking platform. Go to the area where you see some green chemical pools and a bridge or a walking platform on the right side. Go under the bridge then move beyond it. You will see a secret area, where you will find a Hollymya +3. You will not be able to see or identify that area if you only stand under the bridge.