branch

 term.clear()
 term.setCursorPos(1,1)
 print("How far?")
 distance = read()
 y = 0


local function smartForward()
  while not turtle.forward() do
    if turtle.detect() then
      turtle.dig()
    elseif turtle.attack() then
      print("Aggressive life forms detected!")
    else
      print("Impossible to move forward")
      return false
    end
  end
  return false
end


local function dig()
  for n = 1, distance do
    turtle.dig()
    turtle.digUp()
    turtle.forward()
    turtle.digUp()
  end
end


while true do
  print("Mining " ..distance.. " blocks")
  turtle.select(1)

  for i = 1, distance-2 do
    smartForward()
    end

    for n = 1, distance do
     turtle.dig()
     turtle.digUp()
     turtle.forward()
     turtle.digUp()
    end
    turtle.select(16)
    turtle.turnRight()
    turtle.dig()
    turtle.place()
    turtle.turnLeft()
    turtle.select(1)
    end
  for o = 1, distance do
    turtle.select(1)
    turtle.placeDown()
  end

  dig()

      y = y+1
          while y>5 do
           y = y-6
          end

  turtle.turnLeft()
  turtle.turnLeft()
  for l = 1, distance-1 do
    turtle.forward()
  while not turtle.forward() do
    turtle.dig()
  end
  turtle.turnRight()
  for m = 2, 15 do
    turtle.select(m)
    turtle.drop()
  end

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

  print("Tunnel complete")
end