Liu Hai had to get rid of himself, because he estimated that the superior department might also set up a special unit to study this.
Liu Hai can't say that this thing is a pit. The superior department should not study it.
Of course, the pit is not a complete pit. If it is just a research, it will be helpful for the design of stealth aircraft in the future.
Therefore, Liu Hai specifically mentioned his own technology in the technical data submitted last time, which was designed according to a paper by a scientist of the fat bear.
The theory of stealth technology came from the fat bear mathematician Ufi Mochev in 1964