[qiqing]

Here's a video from Chinese TV in Feb before the landing that someone else posted in this thread: https://www.youtube.com/watch?v=rBhVaihkDvc

I realize it doesn't have English subtitles, so I'll summarize some highlights of what's in there:

* interviews with scientists and engineers working on the project

* trajectory of the spacecraft and lots of talk about the challenges of reducing velocity for landing

* historical overview and context for why Mars exploration is important for science

* what to expect in the future landing and when it'll happen

It's pretty similar to video programs that NASA produces. Not sure what information you're expecting that isn't out there, but I think you're attributing to secrecy what is more easily attributable to people not translating open public reports into English.

[mturmon]

Here's a technical review of the (engineering, not science) imaging system for Perseverance, published in November 2000 before a touchdown in February 2021:

https://link.springer.com/article/10.1007/s11214-020-00765-9

Here's the process for how the landing site was selected:

https://mars.nasa.gov/mars2020/mission/science/for-scientist...

I think this is more open than the Zhurong information has been, but I'd be happy to learn more.