In the last few days an incident occurred where a Chinese destroyer collided with a Chinese coast guard ship, while both were harrassing a filipino fishing boat and a filipino coast guard ship. After the collision, the PH CG ship offered medical assistance to the Chinese ships, with no reply.
What I want to point out though is the damage to the destroyer......is consisted of a few scratches and a dent. The Chinese CG ship's bow was completely crushed, in contrast. you can google search this easily.
There have been several high profile collisions in the last few years involving western ships, most of which show major damage and several being declared non salvageable.
The point is- western ships have thin steel shells and it looks like China has possibly decided to improve survivability with thicker/stronger ships.