I bought a house with a small underground warehouse, and I'm going to decorate it and put things there. How can the decoration not be wet?

You can consider using waterproof film to try. My family has a basement, and there are some problems in summer. My house is still semi-underground. At that time, PD Deyou Gaorou waterproof membrane was used, and the effect was good. Because the neighbor's house was not decorated, I once went to their house to get something. Compared with my home, the effect of waterproof membrane is really obvious. You can also try.