newTunnel

local args = { ... }
local distance = tonumber(args[1])
local torches = 2
local cobblestone = 3

local function refuel()
    if turtle.getFuelLevel() == 0 then
        local prev = turtle.getSelectedSlot()
        turtle.select(1)
        if not turtle.refuel(1) then
            print('Need more fuel')
            while not turtle.refuel(1) do
                sleep(1)
            end
        end
        turtle.select(prev)
    end
end

local function tryForwards()
    refuel()
    while not turtle.forward() do
        if turtle.detect() then
            turtle.dig()
        end
        sleep(0.5)
    end
end

local function tryDown()
    refuel()
    while not turtle.down() do
        if turtle.detectDown() then
            turtle.digDown()
        end
        sleep(0.5)
    end
end

local function tryUp()
    refuel()
    while not turtle.up() do
        if turtle.detectUp() then
            turtle.digUp()
        end
        sleep(0.5)
    end
end

local function placeTorch()
    local prev = turtle.getSelectedSlot()
    turtle.select(torches)
    turtle.place()
    turtle.select(prev)
end

local function placeBlock()
    local prev = turtle.getSelectedSlot()
    turtle.select(cobblestone)
    turtle.placeDown()
    turtle.select(prev)
end


local function clearSection(currDistance)
    tryForwards()

    if not turtle.detectDown() then
        placeBlock()
    end

    if currDistance % 6 == 0 then
        turtle.turnRight()
        turtle.turnRight()
        placeTorch()
        turtle.turnRight()
        turtle.turnRight()
    end
    tryUp()
    turtle.turnLeft()

    tryForwards()
    turtle.turnLeft()

    tryForwards()
    tryForwards()
    tryDown()
    turtle.turnRight()
    turtle.turnRight()

    if not turtle.detectDown() then
        placeBlock()
    end

    tryForwards()

    if not turtle.detectDown() then
        placeBlock()
    end

end

turtle.select(1)

turtle.turnRight()

for i = 1, distance, 1 do
    clearSection(i)
end
turtle.dig()
turtle.turnRight()
turtle.up()
for i = 1, distance, 1 do
    tryForwards()
end
tryDown()
for i = 3, 16, 1 do
    turtle.select(i)
    turtle.drop()
end