I'm not entirely sure on China's views on cremation or other forms of - for lack of better term - disposing of the dead.
However, wouldn't it save some space if they bury the dead upright as opposed to laying down? Sure they have to dig deeper, but it'd be a smaller area where they could probably fit graves closer together because they can narrow lanes. (For some reason that sounds highly insensitive.)
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Not a bad idea at all.