bdd4e120_phy_Guide___PS3_Trophies_Forum__Description
[Location Number] 2 [Location Name] Infused Grotto [Description] 
This is an absolute pain to find. From the Catch a Ride head down the main road and turn right to go through the big Hyperion door. Once you are through the door, turn around and head back to the door, but don't go through it. Back up and look up on the tower of the wall on the right side and as you back away you will see a blue light flash. Shoot this to diffuse the Fuse Box and lower an electrical gate. Now head through the door and turn right. Immediately look over the right side as you are going down the road and you will see an opening off the road. Drop down there and get out of the car. Head down the ladder to discover this hidden grotto
Borderlands 2 Trophy Guide - PS3 Trophies Forum