Turtle.digCorridor = function(length, height, width)

    b = 1
    if height > 2 then
        Turtle.up(true)
        b = 2
    end

    atLeft = true

    for c = 1, length do
        if width > 1 then
            if atLeft then
                Turtle.turnRight()
            else
                Turtle.turnLeft()
            end
        end

        repeat
            restHeight = height - b

            for a = 1, width - 1 do
                if restHeight >= 1 then
                    Turtle.digHelperTri1()
                else
                    Turtle.digHelperTri2()
                end
                Turtle.forward()
            end
            atLeft = not atLeft
            Turtle.digDown()  --- fix for height < 3
            Turtle.digUp(true)--- fix for height < 3

            diff = 0
            if restHeight > 2 then
                diff = 3
            elseif restheight == 2 then
                diff = 2
            end

            if diff > 0 then
                if c % 2 == 1 then
                    Turtle.up(diff)
                    b = b + diff
                else
                    Turtle.down(diff)
                    b = b - diff
                end
            end

            if width > 1 then
                Turtle.turnAround()
            end


        until restHeight <= 1

        if atLeft then
            Turtle.turnLeft()
        else
            Turtle.turnRight()
        end
        Turtle.forward(true)
    end

end