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I'm still sure it's Lucanidae larvae. Look at the anal segment of larvae, its very unique in european Scarabaeoidea. See here http://www.entomo.pl/forum/viewtopic.php?f=109&t=12940 European Lucanidae of course live in rotting wood but most often in wood underground, and frequently builds pupal chamber in soil. Now I think Alexandru larvae is more probably Lucanus cervus (very common species in Suthern Europe).

Regards,
Lukasz