Well the following PDF file link is for the report.
Its barely 4 pages long and to be frank looks more like a press release than a scientific document. (I have to prepare more simply to get small loans from the Bank).
In summary - a torpedo did it. Some bits of torpedo was found underwater that looks a bit like a NK torpedo and had a North Korean symbol painted on it. Therefore North Korea did it.
And that is pretty much it.
Nothing on metallurgy and nothing about explosive traces. A report more noticeable for what is left out rather than included.
a) This is a military interest community. b) People who come here are by definition somewhat computer literate. - Combining those two factors I think it's fair to suggest you ought to have conducted your own research rather than throwing half-baked conspiracy theories around and asking others to do your research for you.
Planeman, I am pleased for you if you have the luxury of time and other resources to plough through pages and pages of search engine results which link to endless internet news sites all showing the same tiny press releases.
I have looked for schematics for other Torpedo's which show the internal drive shaft assembly but have found more for Photon Torpedo's on the Starship Enterprise than I have current Torps in the USN ROKN inventories.
I would not be surprised if many others have the same restrictions as do I.
Mr T if you are seriously telling this forum that Intelligence releases over the last twenty years concerning the activities of countries that the West does not like, have been honest and clearly presented and in no way intended to mislead then I find you either disingenuous or seriously lacking in critical ability!