ChunkMining

local StarterDepth = 8
local Length = 3
local Width = 1

local Depth = 2

local DigUp = turtle.digUp
local DigDown = turtle.digDown
local Left = turtle.turnLeft
local Right = turtle.turnRight


local function InventoryCleanup(force)

    if turtle.getItemDetail(16) or force then
        turtle.select(1)
        turtle.placeUp()
        for i = 2, 16 do
            turtle.select(i)
            turtle.dropUp()
        end
    end

    turtle.select(1)
    DigUp()

end


local function Forward()

    DigUp()
    InventoryCleanup()
    DigDown()

    while not turtle.forward() do
        turtle.dig()
    end

end


local function Down()

    DigDown()

    if not turtle.down() then
        return false
    else
        Depth = Depth + 1
        return true
    end

end

local Laps = Width*8
local ReturnWidth = Width*16-1
local LapLength = Length*16-2



for i = 1, StarterDepth do
    Down()
end


Forward()

while true do
    for i = 1, Laps do

        for i = 1, LapLength do
            Forward()
        end

        Right()
        Forward()
        Right()

        for i = 1, LapLength do
            Forward()
        end

        if (i == Laps) then
            Forward()
            Right()
            for i = 1, ReturnWidth do
                Forward()
            end
            Right()

            DigDown()
            Down()
            DigDown()
            if not Down() then
                InventoryCleanup()
                for i = 1, Depth do
                    turtle.up()
                end
                InventoryCleanup(true)
                exit()
            end
            DigDown()
            Down()
            Forward()

        else
            Left()
            Forward()
            Left()
        end
    end
end