When you have received your pick axes, go through the Jungle Trail until you reach the hole that leads to the Flooded Courtyard. Go around it to the mesh of roots, and roll under it by holding down R and using the Left Analog-stick to control your movement. Get past the scorpions and use your pick axes to climb up the ice. On the ledge above the ice, you will see a hole, in which is the shortcut to the Flooded Courtyard. Roll under it. When you arrive at the Flooded Courtyard, to your right you will see the explorer in a cage. On the bottom ledge there is an idol.