I think a ship has to be tested in extreme cold and hot weather before commissioned, also cruising for a long range. We don't want to see the kind of fiasco of Type 45.She's probably there for warm water trials or to avoid doing trials in the cold climate up north. Or it can be both. The PLAN tends to sends ships down south during the winter. In the meantime, and probably before she left Hainan for Qingdao, she borrowed the degaussing dock in the submarine bay usually reserved for the 093s and 094s.