A scene about a device such as sonar underwater

I have tried to link Cesium with Babylon for GIS,So how can i build my scene underwater in more clearly and higher pixel
Thank so much if can provide a playground

There are some examples of underwater scenes: Water material that works above and below water? - Questions - Babylon.js (babylonjs.com)

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Maybe that can help:

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thank you! I truely apply it to link GIS,but Cesium can not build a scene above water or ocean which is my question

thanks ,is truely helpful