The incident, the Chinese official press reported immediately, and this surprised me, because China's past have also done a submarine accident,but has never officially publicly reported.
The accident, the submarine is intact, but all the crew members died, the submarine was found by fishermen, and then towed back to base,
In the TV news, I saw then entered the Central Military Commission Chairman Jiang Zemin personally inspected inside the submarine, no damage inside the submarine, it seems that normal.
At that time, speculation is that the submarine off from the test mute accident, the submarine suddenly internal hypoxia( very closed to Snake65 opinion ),and there are rumors submarine violated the regulations, allow too much access to submarine - of course this is not the main reason for the accident.
The incident so that the commander of the Navy Shi Yunsheng duties were removed.
As for the accident because testing AIP, I just can tell.