Just let it soak in the water. You don’t have to think about what to do. The cables laid at the beginning of the design have strict requirements for waterproof sealing. There are strict mandatory regulations in national standards and IEC.
I used to do construction in some cable trenches in southern coastal cities. Some cable trenches were filled with water all year round. I saw a line soaked in water for almost 20 years. I knew that when we updated and replaced this line All good.
Unless the cables you use are Sanwu products, don’t worry.