They do not make zero splash, just not a lot of splash.
The amount depends on the body’s position and how it changes both when it hit the water and when they are underwater.
You can see a 6 minute video about just that [https://www.youtube.com/watch?v=8GqWTqDhahM](https://www.youtube.com/watch?v=8GqWTqDhahM)
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