Ah.. that'll be it lolI think you will find it is upside down. That is what is hiding the details!
Show off!Nice, a trepanning tool to give it it#s technical name
Cutting a hole in a scull would negate the purpose of a scull wouldn't it?Sometimes used for cutting holes in sculls, not with a plasma cutter though
It's to allow fish to swim throughIt’s probably a H&S law so boats don’t go too fast?