Explainer.Zone on Instagram: "In this video, a woman dips underwater with an upside-down bucket placed over her head, creating a pocket of trapped air that allows her to breathe while submerged. The simple trick works because of basic physics — specifically air displacement and pressure balance. When the bucket is pushed underwater, the air inside cannot escape, so it forms a sealed bubble. Water pressure pushes up from below, but the trapped air keeps the space inside breathable (for a short ti