The Main tunnel is the main intersection of two blocked items for the balloon which is behind Two Blocked tunnels. One in the centre is the propeller room and the one at the end is the Rocket lab. There are fifteen Zombie Dust Bags and
There are two water wheels in one of
the passages. at the end of the tunnel is a lever, pressing 'X' will activate it and turn on the water wheels. At the platform above the wheel is an extra life and a lever. You will need to find your way up to activate the switch. Go back to
the main tunnel and you will find a lever in the same room where the water wheels were activated. use the switch to start the platforms moving down. Jump up the platform to activate the switch up there. This will release the Killadillos. Stand in front of the blocked entrance, double jump when they are heading towards you. This will blow open the two blocked tunnels. You can access the Propeller Room and the Rocket Lab now.