According to Diggy's father research, each of the New World civilizations possesses one activation crystal. Getting them won’t be easy, but with his rich archaeological knowledge and Diggy's physical prowess, we WILL succeed. Let’s pay a visit to Aztecs first.
Legends say that one of the crystals we're looking for is in the nearby Aztec city, right in the heart of a pyramid. Follow Diggy's father and talk to Aztec chief.
He will tell you that they have something that fits your description of activation crystal hidden in the pyramid. But the area is sacred and they can’t just let anybody inside. Help them with their problem, and they’ll consider letting you in.
Firstly, we need to flood the coast in the west. There is a cave nearby from which we can pump up the water onto the shore. Come to the guy after you are done.
You will find the trees there that are ready to be cut down and used for the spikes needed for the second task. The trees are marked by a red cross.
Then, in order to flood the shore, you need to connect the entire pipe system up to the spring, which is deep in the cave. Once you repair the following part of the pipes ...
... there are two more valves deeper in the cave towards the spring. Fix the pipes and then turn the valve on:
Then please exit the cave and turn the valve on:
The second task will be increasing the security of the eastern shores by putting spikes there. To do that we need wood that we've already got from the west. Fetch it and install the spikes on designated spots. Return to the guy after you are done.
The third task is connected to the mountain pass north of the village that must be blocked with stones. Once it is done, return back to the guy. Follow Diggy's father, he will show you the way. He will help you block the mountain pass.
Go up there and push some boulders down. You will block the mountain pass with them.
The first boulder:
The second boulder:
When you push the first two boulders on the right side, then do the same on the left side.
Great job! In order to return to the city, please enter the cave and pull the lever. You will unlock a shortcut to the city.
Let’s go back to the chieftain and then you may enter the pyramid. Beware though, it is said that one of the greatest Aztec glassmakers had his hand in its construction - the guy sure liked looking at himself in the mirror. At its core awaits your prize - the activation crystal. Lucky there’s two of Diggy, two heads are better than one.