I find this, interesting
Essay: Inside the Design of China’s Yuan-class Submarine
For comparisons, design, size
View attachment 37477 View attachment 37478
On those stills it looks like it's doing 0.0 knots or barely moving at all. On the third picture you posted it's starting engines I assume... Pretty strange selection of shots.32nd Submarine Flotilla to Sanya-Yulin !!!
She have 4 Kilo/636M ( the last ) and 4 Song/039G View attachment 38647 View attachment 38648
On those stills it looks like it's doing 0.0 knots or barely moving at all. On the third picture you posted it's starting engines I assume... Pretty strange selection of shots.