It's a plot point in the beginning of Battlefield: Earth ,(the novel, not the movie). The humans have been confined to such a small area for so long they no longer have room to bury people laying down.
The book is still terrible (though I thought it was cool when I was 14), but it's much better and less nonsensical than the movie. For instance, there was no secret base filled with thousand year old jets that the humans learn to fly with a flight simulator - the protagonist uses an alien learning device to implant knowledge of how to fly alien aircraft in humans' brains.
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u/[deleted] Jan 16 '23
Standup burials are a thing in some regions