No One Can't Dig A Tunnel In The Middle Of The Earth Because The Tempature Inside Earth Gets Hotter As You Go Deeper. It Is Around 9000F (5000C) In The Center. It Is So Hot Inside Earth That Rocks Melt.
Because there is a inner core which is in the middle of the earth and is very hot and a bit like the sun. btw this tells you nothing Update: In part due to radioactive decay of uranium, thorium, potassium-40, etc.; and the insulating effect of the outer layers.
the skin of earth, our planet it is the crust because it is the place that is at the top if it was the middle the core is burning hot so it wouldn't be the coolest then it would be the hottest if u know what moho means please tell me