Okay, in the tunnel, there are a few things:
-A static model of the monsters belly as soon as you enter the tunnel (on the upper left hand corner of the ceiling).
-A set of screens on the left (inside wall) that were turned off for public rides. This shows the monster simply swimming.
-One screen on the right (outside wall) that has the monster roaring at the train. Depending on the dispatch time, you may not see it as the video is on a constant loop.
-There is lighting shining on all static theming around the screens and on the belly in the mountain.
The statue is at loop #2. No regular guests have seen it because it was put up this week while the park was closed. It is a physical encounter with the head of Nessie coming out of the water.
The story goes, if you listen carefully, you find nessie in the cave (on the right screen), on lift 2 the narrator is basically saying "you found him, hurry, he's after you!" And then a roar. Then loop #2 is another roar and you escaping from the monster and then the final brake is basically congratulations you found him and escaped.