The Sewer was a secret area under The Park in Bakugan Dimensions. It was an underground shortcut between, the River Bank and the Skate Park. Some player's on Bakugan Dimensions used the Sewer as a hang out or a hiding place. Emperor Barodius and Kazarina used to be located here before they were moved to Gundalian Ship.
How to get to the Sewers
Go to the house beside the river and enter the gap at the right side of the house.