Entrance 3 (The small arrow under I shows which way to go. This time down)
Entrance 4
Entrance 2 (Yes, Just jump!)
Entrance 1 (Down! down!)
Which way to go :
.
.
Underground mark
Deep Tunnel
Go Up!
The destination is not finished yet. In fact, its far from complete. It just shows the way how to get there. Multiple entrance. After completion the whole architecture will spread from one island to another.