Diving bell is a kind of unpowered single diving vehicle, which mainly meets the needs of diving rescue and offshore oil and gas development. Its shape is almost spherical. Early submersibles were a vessel with an open bottom that resembled a bell in shape. Most modern diving bells have been changed to completely closed structure, and the design has become more complex. Used in underwater construction works and offshore oil drilling platform maintenance work, and sometimes diving into the water to rescue people on board a shipwrecked ship to safety. Solid Buoyancy Materials are mainly laid on the outer surface of the shell to provide buoyancy for the diving bell and adjust its mass, center of gravity, floating volume, floating center and stability.From solid buoyant materials