Most strange they should admit this rather than blame it on the south.
Quote:
North Korea has revealed that one of its warships sank last month, killing a number of sailors, in a rare admission of military failure.
State media reported a visit by leader Kim Jong-un to a naval cemetery for the crew of "submarine chaser No 233".
Photographs showed Mr Kim surrounded by more than a dozen gravestones inscribed with the date 13 October.
The report said the vessel had been performing combat duties but gave no more information about what happened.
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http://www.bbc.co.uk/news/world-asia-24800228