local x, y, z  = gps.locate()
Counter = 0
while turtle.detectDown() and y > 4 do
  turtle.digDown()
  turtle.down()
  Counter = Counter + 1
  local x, y, z  = gps.locate()
end
if y < 5 then
  for n = 1, Counter do
    turtle.up()
  end
else
  for n = 1, 4 do
    turtle.dig()
    turtle.forward()
  end
  while turtle.detect() do
    for n = 1, 3 do
      turtle.digUp()
      turtle.digDown()
      turtle.up()
      turtle.dig()
      turtle.forward()
    end
    turtle.turnRight()
  end
end