Immigrants have no legal documents.

There are great differences between stowaways, repatriated passengers and transit passengers without visas. According to relevant public information, stowaways refer to people who directly enter a country or region without approval, ignoring laws and state regulations, without any form of review or approval, and without any formal procedures. Returned tourists refer to foreign citizens who are recognized by the state or local government as illegal and can be repatriated according to law. Visa-free transit passengers refer to the convenience provided by some countries, which allows foreign passengers with certain passports to transit visa-free for a limited time, but they must hold valid passports, boarding passes and other relevant documents.