...What forensic examinations were conducted in this incident?...
The known official documents have been gathered on this website "Dyatlovpass.com" by the administrator "Teddy" under the headings "CASE FILES" and "DEATH".
There is already a lot to read and I have the impression that it will be difficult to learn much more about DPI given that the deaths occurred 61 years ago and that the current Russian authorities would probably prefer to forget about it.
I do not have any particular competences but using my common sense and a bit of general knowledge I have arrived rather easily at a reconstruction which seems to be able to explain all the statements gathered on this website.
Of course it is a hypothesis that remains without indisputable proof
and that you will find here : https://forum.dyatlovpass.com/index.php?topic=411.0
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with the important considerations of the physiologist Eduard Tumanov at the top of the page.
I would be glad to have the opinion of a professional expert interested in this case.