Zhao Yi mentioned the related plan at the laboratory meeting.
The main difficulty of the experiment was creating a vacuum region. Creating a vacuum region itself wasn't difficult; for example, a region of a few cubic centimeters could be completed with some small components, but when expanded to a space measured in cubic meters, the difficulty would geometrically increase.
The experimental equipment for creating vacuum regions available on the market could only create up to half a cubic meter, or an even smaller vacuum space.
Some physics labs also had the technology to create vacuum regions, but the areas they could create were not very large, and due to the need for sealing, it was very difficult to add equipment inside.
There was no physics laboratory in the country with a super-large vacuum area.