#$%^&*AU2016250331A120161110.pdf#####ABSTRACT A tunnel 2 for the in-line anti-bacterial treatment of plucked poultry carcasses (or other animal carcasses) with a liquid cryogen or a cold gas at a temperature of less than OC has an entrance 18 and an exit 20 for the poultry carcasses. A continuous slot 28 is formed in the roof 8 of the tunnel and extends from the entrance 18 to the exit 20. Poultry suspension shackles 24 are able to pass through the slot 28. Thus, poultry carcasses are able to be conveyed through the tunnel 2. The slot 28 follows a path which reverses direction at least once. Typically, the slot 28 is generally S-shaped.