In this lesson, students investigate how digital messages travel across the world by examining the physical infrastructure that supports the Internet. Students begin by sharing what the Internet is and analyzing maps of undersea cables to see how global communication depends on physical systems shaped by geography. Students then participate in an unplugged activity to model how messages are sent over long distances through a network of connected nodes. Finally, students create their own model to explain how a message travels from sender to receiver, and examine potential challenges, such as delays or failures in the network.