Getting starting with turtles, don't understand why mine won't move after digging

http://pastebin.com/DCiChxLv

So basically, I check if there is sand, then dig.

Two issues:
1) If there is sand below, I get "Sand6:31: attempt to index ? (a nil value)" , which is turle.down()
2) If there is no sand below, it just digs the sand around it then continues to turn forever, never moving.

I am basically just trying to set this up in a desert and have it go mine all the same efficiently it can find, and not mine anything else. Any help would be appreciated.

Well, turtle.down will work better than turle.down.

Have you fueled the turtle?

Lyqyd, on 15 March 2017 - 07:43 PM said:

Well, turtle.down will work better than turle.down.

Have you fueled the turtle?

Thanks that solved it.. it lost its fuel after i replaced it

If you label the turtle, it won't lose it's programs and fuel when you break it.

label set YourLabelHere