C2776 There Are so Many Requirements

To Qin Guan, since he had to do it, he had to do it the best he could. In any case, even if he didn't ask for it, the Ruby Design Bureau would still improve it.

Although they were both called Kilo-class submarines, there was a huge gap in their performance. In the early days, they were called Type 877. Later on, they were called Type 636, and their appearance didn't seem to have changed much