The Large Cannon is a weapon attachment to the gun barrel on the the right side of Dr. Eggman's Egg Walker. It mostly resembles the classical version of a real-life bazooka, possessing a dark green barrel with a yellow stripe, a red mouth and rear and a gray, square joint where the Bazooka is equipped to the Egg Walker. When obtained, it allows the Egg Walker's Volkan Cannon to break Steel Containers. It is the equivalent to Miles "Tails" Prower's Bazooka.
The Large Cannon is found at the beginning of Weapons Bed and is necessary to complete the stage. When beginning on the carrier, the player must head down the path until they reach the end of it. Once there, they will find the control center on the left, with three small room in the building, each blocked with dynamite. They should head into the room in the middle, and the Large Cannon can be found just behind the door.