-- Quarry Parameters
local depth = 122  -- Total depth of the shaft (63 to -59)

-- Main Quarry Loop
for d = 1, depth do
    -- Clear above the turtle
    while turtle.detectUp() do
        turtle.digUp()
    end

    -- Dig down and clear the way
    turtle.digDown()
    turtle.down()

    -- Dig a 5x5 area
    for w = 1, 5 do
        for l = 1, 5 do
            turtle.dig()
            turtle.forward()
        end

        if w < 5 then
            -- Turn for the next row
            if w % 2 == 1 then
                turtle.turnRight()
                turtle.dig()
                turtle.forward()
                turtle.turnRight()
            else
                turtle.turnLeft()
                turtle.dig()
                turtle.forward()
                turtle.turnLeft()
            end
        end
    end

    -- Return to starting position
    for i = 1, 4 do
        turtle.back()
    end

    -- Return to the surface
    turtle.up()
end
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