In the future, the outer sheath of cables under deep seawater will be made of glass, not special steel or aluminum alloy. Because metal has a granular microstructure, under deep-sea pressure, the metal sheath at the particle boundary is easy to break. And glass Although it looks solid, it flows under pressure and can,, therefore,, be considered a liquid. Can it be launched from this? ['All so-called solids can be considered as slow-flowing liquids.', 'Glass is more suitable as a building material than steel or aluminum alloy.', 'Liquid has no granular microstructure.', 'In future deep-sea operations, FRP will replace metals and play a greater role.']