Physics error at a very high velocity

Cesrate

I build a simple small rocket (with FAR), which could hit the ground upside down at an approximate speed of 1,000-1,200 m/s if launched vertically(as the reentry heat hasn't been implemented; the Q reached up to 800,000 and the super G will certainly destroy any structure in the real case). Then we can see the physics error...

First, impact on the ocean:
The first impact amazingly didn't destroy any part- the lower part(used to be upper), nose cone+pod+battery+fuel tank were rebounded to the air, while the upper engine's linkage was broken and the engine sunk into the ocean for about 200m... The next impact of the lower part was destructive, but the engine in water remained. After I selected the engine, it came up slowly, then reached the surface.
(The number altimeter showing is in fact negative)


Second, impact on the ground:
No need for words:)

☆星の子☆

瀑布汗

Showchen

你是在玩蹦床吗?

看看飞行日志，你别告诉我就掉了个引擎

Showchen

超。。。。级蹦床？

flyfire2002

会不会是FAR的影响呢？

8749236

这我知道。这发生过。
不过并不是100%的。
我曾经遇到过但是尝试复制问题时失败了很多次=\
还有，KSP即使你以最大速度撞向水面也有可能幸存。如果你还记得发射火箭中有时因为结构强度不够，下方的火箭钻进上方的部件里的情况的话。一切就很简单了……
KSP在发生撞击时，每一个物体都可以作为缓冲来用……