Hello all i am thankful for being a member of this site, i have some question specially in all expert in treasure hunting here, when i was child i discover a rock in my father's farm, that rock is unusual to all rock because it like a barel or fuel tank kung pukpukin(if hammered), i am very curious until now, what inside that rock it possible that there is a gold inside or a tunnel what? its a big big rock next time i post the actual image of that rock..