Gaming SHAMUS DEEP SEA ADVENTURES

[Leah]

If anyone is playing/has played this game, does anyone know how to shoot the cannon in level 7 to hit the switch to open the big stone gate? I have opened one gate with a cannon, but it's the second time you acutally come across a cannon. I can find the ball and the cannon, but evertime I go near the cannon to shoot it, it just goes off in a funny direction! Is there a way of directing it or something along those lines?
I do apologize if no one even likes this game but I thought it was worth asking hehe

Kind Regards