trtl_log

------ ( Functions ) ------

function checkFuel()
  if turtle.getFuelLevel() == 0 then
    turtle.refuel()
  end
end

------ ( Program Start ) ------

turtle.dig()
turtle.forward()

while turtle.detectUp() == true do
  checkFuel()
  turtle.digUp()
  turtle.up()
end

while turtle.detectDown() == false do
  checkFuel()
  turtle.down()
end