Here is a guide on How to find the Cannon on Siberiade.
Serious Sam Siberian Mayhem Cannon Location
The Cannon is a secret weapon you can find ammo for a few times leading up to it, you can find it near the end of the level inside one of the Windmills.
When you enter the Windmill you will need to shoot the wood at the top to break it so the Cannon can fall to you.
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