Hi Sutton, who apparently has access to higher resolution imagery, says that 09X actually does have a small sail, and that the recent Bohai and new JN boats are the same.
Doing a lot of assumption here:Building two boats at once is in itself unusual, building two identical submarines at exactly the same time in two yards. The Huludao yard on the Bohai Sea is the yard normally associated with nuclear submarine construction, while the JN Yard in Shanghai is completely new to nuclear submarines. First of class submarines typically have more teething problems than their follow-on siblings, and building two exasperates this. And added to this, it complicates supply chains and quality control.
- Assuming both having been built at the same time, as opposed to simply being spotted at same time
- Assuming it's first of class, and not just first of class to be seen.
- That JN yard built it and not just supporting a previously built but not spotted hull.


