Activate the eclipse. 12 pannels have appeared on the map, you need to knife each and everyone of them.
They are located:
In the spawning room, left to the Pack-a-Punch staircase
Facing the door right to Quick-Revive
Right in front of the previous one
Facing the door leading to the cart
Right in front of the previous tile
In the room with the cart and Brock and Garry's brick prison, on a wall facing the spawn
Next to a gong near the minecart
In the power room, at the left of the left power switch
In the room between the waterfall pool and the power generators room, on a wall
On a wall before the small stairs
In the area between the wooden bridge and the mud maze, on the far left when coming from the bridge
In the mud maze, on the right when you are heading to the water slide
Once done, head back to the minecart located above the area with Brock and Garry's brick prison. You should see a wooden tipi. Destroy it with an explosive. If done correctly, you should have come back to the present.