How is Spain's illegal detention in Germany safe and how can it not be investigated?

This question is just asked to the right person. After living in Germany for ten years, I once returned to Germany from Spain on business. I met a young man who sneaked into Europe on the train and wanted to go to Germany from Spain. I talked with him all the way, and he told me that according to previous experience, the best way to walk around European countries without being discovered is to take a ride. At most, take a copy of a fake passport by train, and take a look at it when you meet the police, without delving into it. And the clothes should be clean at least, and the ragged police will definitely go deep into it. There is a one-day ticket around the world in Europe on weekends, which is quite cheap. You can take all the ordinary trains in Europe (you can't take the express trains such as ice ic). If you are already in Europe, I suggest not going to Germany, but to Paris. There are still many Chinese in 13 area, but gangs really exist there and life is very hard. . Finally, I suggest not to stay in Europe through illegal residence. It's not the same now. Countries have cracked down hard on illegal immigrants, and the repatriation process is very fast after being caught, and the people in Europe are also having a hard time. Besides, the domestic development is so good now, and there are opportunities and things to do everywhere. Why bother to go further and further?