Upward-Gang

turtle.turnLeft()
while not turtle.forward() do
    turtle.dig()
    sleep(.5)
end
for i = 1, 70 do
    while turtle.detect() do
        turtle.dig()
        sleep(.5)
    end
    while not turtle.up() do
        turtle.digUp()
        sleep(.5)
    end
end
repeat turtle.down() until turtle.detectDown()