Consciousness Persists Only Where It Can Experience

Think about this in the first person:

I only know one thing with absolute certainty: I am conscious. This subjective core of experience, in which I feel myself here, now, in this moment reading this sentence - this qualia - is something undeniably mine. My entire reality begins from this point. I only assume, as a social and empathetic human being, that other people (and maybe other living beings?) are also conscious.
Without entering metaphysics or religiosity, consciousness requires a support. For now, we only know the biological - the brain - as capable of supporting consciousness. We don’t know about the future. But let’s consider the following hypothesis:

Consciousness (as experiential qualia) never dies in its own world, because it only persists where there is a world it can experience.

When the world ceases, there is no experiential void - there is simply the end of the field in which experience could happen.
We cannot experience non-happening, nor register the cessation of qualia.
If consciousness ends, it is not aware of it; if it continues, it simply continues.
Therefore, from the first-person perspective, consciousness always is while it is - and its end, if it occurs, is never lived. Thus, in the only world given to it - its own - consciousness never dies.
There is no way to logically prove that immortality exists. We say something more precise: death does not belong to the experience of the self.