Hi Dave, - sorry - that came across as being a smart ass didn't it! Yep there is a tunnel under Modbury High and if you go to their old scholars site on facebook it will give you all the info.
Cheers

Ah yes, but the tunnel is only inside the school. I think Blackwood High had one too, and someone set off a smoke bomb there during a school assembly...

Cool! Thanks Leanne, I will check it out!