mineshaft

aArgs = {...}
local depth = aArgs[1]

function digForward()
  turtle.dig()
  while turtle.forward() == false do
    turtle.dig()
  end
end

function digUp()
  turtle.digUp()
  while turtle.up() == false do
    turtle.digUp()
  end
end

for i = 1, depth, 1 do
  turtle.digDown()
  turtle.down()
  if i > 1 then
    turtle.placeUp()
  end
end

turtle.turnRight()

digForward()
turtle.digUp()
digForward()

for i = 1, depth - 1, 1 do
  digUp()
  if i == 2 then
    turtle.turnRight()
    digForward()
    turtle.turnRight()
    turtle.turnRight()
    turtle.select(2)
    turtle.place()
    digUp()
    turtle.select(4)
    turtle.placeDown()
    digForward()
    turtle.dig()
    turtle.select(3)
    turtle.place()
  end
end

turtle.turnLeft()
turtle.forward()
turtle.turnLeft()

turtle.select(1)