Hrm. I've thought about this a lot and came to the conclusion that we, or rather our brains are just an antenna, 'receiving stuff' from another plane of existence.
If you change/destroy parts of the antenna or the 'bioelectronic circuits' the channel fades out, and you get more and more noise, until there is no signal anymore.
No more resonance with the frequency of your station.
That equals death on this plane.
What lead me to this apart from NDE/OOBE are the cases of so called Terminal Lucidity, when old or very sick people die, but regain conciousness in their last moments. In a timeframe from sometimes two to three days before exitus, but mostly just a few dozen seconds to minutes before exitus.
The thing is that some of these brains are so rotten and degenerated, that it is impossible according to our current understanding, that these people are even able to do anything coordinated, not to mention speak, and recognizing their loved ones/family, telling them things.
And yet this happens again and again, not that often, but it does. While their brains are absolute mush.
In a similar vein, there are stories of lost animals like cats and dogs finding their way back to the humans they once lived with. Over long distances like several hundred miles, often after years.
That can't happen by random chance. So either they can read signs, and understand our words better than we think, or there are other mechanisms at play.
What that is telling about this otherplaneness is uncertain, just that it exists.
Probably impossible to gain any certain insights about that, because of wrong cabling, interface, modulation, format, whatever.
At best we can just hope to skim the interface, membrane and get a few hazy views from the other side near that membrane, but not that far through it.
Maybe there are even other interfaces, membranes, from up there, going on and on, and/or recursing into others.