boom

  while turtle.detectUp() do
    while turtle.detect() do
      turtle.dig()
      turtle.forward()
    end
    turtle.digUp()
    turtle.up()
    turtle.turnLeft()
    turtle.turnLeft()
  end
  while turtle.detect() do
    turtle.dig()
    turtle.forward()
  end
  while not turtle.detectDown() do
    turtle.down()
  end