Shaft

arg = (...)
arg = tonumber(arg) or 1
x = 0
while x < arg do
turtle.dig()
sleep(1)
if turtle.forward() == true then
turtle.digUp()
x = x + 1
end
if turtle.placeDown() then
turtle.turnLeft()
turtle.place()
turtle.turnRight()
turtle.turnRight()
turtle.place()
turtle.turnLeft()
end
end