The issue isn’t only Carbon related. It’s how game entities are networked in the game. There are different network groups for MainIslandGrouo, DeepSeaGroup etc. There is a default network group where entities are able to be globally networked. I have done some testing already and I can make the Heli, debris and fire visible wherever the Heli is called. But the Heli crates that spawn naturally are not networked in the deep sea.
This is easily fixed by overriding the normal crate spawning with custom logic, which I will write and include on the next update. That way, if server admins allow it, players can call Heli signals etc anywhere. I will add config options to allow or disallow it.