Yi Peng 3 crossed both cables C-Lion 1 and BSC at times matching when they broke

It was crossing right on time for the interruptions, a Russian officer was on board, it slowed down while crossing, no other ships were slowing down in that area during that time (rulingnout headwinds) - it cannot get much clearer. China is now participating in hybrid warfare against Europe (unless they present stronger evidence against this assumption)

I strongly doubt that this is an official military act of the Chinese government. It will most likely turn out that this is not an official military act of any government as the intent was to do this in secret.