This article is from the Hittite/Hurrian Mythology FAQ, by Christopher B. Siren cbsiren@hopper.unh.edu with numerous contributions by others.
I haven't found as much about this as I would like:
The olden gods built heaven and earth upon Upelluri. They had a copper
knife which they used to cleave the heaven from the earth, after which
they stored it in ancient storehouses and sealed them up - only to open
them and retrieve it for use on Ullikummis.
Kuntarra house - the house of the gods in heaven.
The Dark Earth, i.e. the underworld, has an entrance with gates. It
holds bronze or iron palhi-vessels with lead lids. That which enters
them perishes within and doesn't return. Telipinu and Hannahanna's
anger is banished there.
 
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