Capture reference to recently loaded scene asycn

Hey folks,

I was wondering if there was anyway to capture a reference to a recently loaded Scene?

I'm using:

 SceneManager.LoadSceneAsync("RockPrototype", LoadSceneMode.Additive)

To load up a new scene, now because I've got several instances of the "RockPrototype" scene, I can't simple find it by name and even it's BuildIndex wouldn't be much use to me. I have considered using the hashcode for each scene as a unique identifier. However if I was going to use this I would need to capture that hashcode at the point I'm loading the scene.

Any thoughts?