The era of gravitational wave astronomy has dawned, allowing us not only to observe the universe but also to "listen" to it through gravitational waves. When a compact object ventures too close to a supermassive black hole, it becomes captured due to the emission of gravitational waves, eventually being swallowed whole as it crosses the event horizon. During this process, the system radiates energy, which can be viewed as a snapshot containing detailed information about the geometry of spacetime and the physical parameters of the system with extraordinary precision. Intriguingly, this information may also hold clues about the topology of spacetime, suggesting a potential link between geometry and topology in the strong-field regime of gravity. This phenomenon effectively maps the warped spacetime, serving as a unique probe of gravity in its most extreme regime. Thanks to these captures, we can now tackle fundamental questions: Do black holes truly exist? How do they accumulate their colossal mass over cosmic history? And what is the true nature of their event horizons?