The Chainsaw is located in the Dissection Room in the Processing Area. It is made available during the fight with Jack Baker after he picks up a weapon made up of a blade and a chainsaw meshed together to resemble a giant scissor. Ethan can use it as a weapon during the fight, or can opt to ignore it, making the fight harder as Jack is capable of utilizing an insta-kill attack that needs to blocked or avoided. Ethan needs to restart the engine in order to use it again after using it for a certain amount of time.