Exiting a foreign country requires proper identification and or documents and money. Then entering into another requires the same. But this is not limited to just nation borders but as well as regional and even less wide sectors within the confines of an individual country.
A valid or “functional” passport is vital but can often be useless without certain other items depending on the situation, location and objective of extrication;
-Documents; Visa, Travel Papers Etc.
-Cash Money in Appropriate Currency
-A Secondary (Backstopped) Passport
-Government Issue ID Card; License
-Digital Copies of All Docs
-Encrypted / Burner Mobile Phone