Create a Physics Volume that fills all world

Hello everybody. I’m creating a full underwater map, and I need all of it to be “swimmable”. I just can get the character movement component working, if the player is overlapping a physics volume that has a “Water Volume” checkbox marked. I can create a really big physics volume and solve this, but there isn’t any better approach to use in this situation?

I already tried to extend the “DefaultPhysicsVolume” class, set as water volume and set the default physics volume in the world’s details to my new class but it did not work.