There are several famous blue hole dive sites in the world. The most cost-effective one is Dahab. This place is located in the free town of the Red Sea. It attracts many diving enthusiasts all the year round. 300 US dollars can get a ow+aow professional diving certificate, get this certificate, you can freely and sneak in the mysterious underwater world. Compared to humans, the seabed is more like a new world, more unknown, more mysterious. When I sneak into the sea every time, the blisters run away from the face, and the body is slow under the effect of buoyancy. Slow into a state of no gravity, another space experience. Every dive is a new test, thinking after defeating fear, focusing more on the living conditions of the sea creatures, thinking like a fish, and the world is as bright as a bubble.