What can you use to see through walls?

To see through walls, technologies like radar, sonar, and advanced imaging systems such as ground-penetrating radar (GPR) can be used. These tools can detect objects or structures behind walls by analyzing the signals they emit and receive. Additionally, thermal imaging cameras can sometimes reveal heat signatures through walls, while certain types of X-ray technology may also provide visual insights into hidden structures. However, ethical and legal considerations must be taken into account when using such technologies.