In the Poopmobile as they return from their last adventure, Peter uses an old trick to divulge the secret of the last Salamanders cryptogram. At the base camp, they decipher the coded message and to their amazement they discover that the last mineral is positioned underneath the Sydney Opera House. How are they going to find it? Sator is heartily amused as he can see their every move on the vision bug, and he gloats in front of a terrified Poopsnagle. Sator has also arranged for Matt to let Dingle and Murk into Secret Valley late one night to take the minerals and Salamanders from the safe in the barn. Blackmailing Matt into helping him get the Doctor's notes, Sator now has all he needs to make Mega Steam.