I would suggest that what I consider to be "outside the cave" might simply be a larger cave, but yes, there is an urge to show people the new space.
I don't think anything comes after death. After death, there is no longer a person who might experience anything.
It's difficult for most people, including me, to properly wrap their heads around the idea of not existing. In the absence of an afterlife, many people still imagine themselves persisting forever, alone in darkness and silence. It's an idea I find more frightening than Hell. (Therefore if there is a Hell, that's how it might well manifest for me.) I remind myself that at the moment of death, there won't be a me anymore, so any thoughts of what might happen to me after death are meaningless.
The energy in the body is eternal, but it's not a soul. It's the simple chemical and electrical energy in our bodily fluids, as well as our muscles and our brains. When we die, it escapes mostly as heat. It also contributes to the reactions which decompose the body. Some of it goes to feed some lucky earthworms, and eventually to enrich the soil around the grave and whatever grows in it.
The Christian concept of a soul has nothing to do with quantifiable energy. (They did try to connect the two by identifying a measurable loss of substance at the moment of death, but ultimately failed.) The soul, hypothetically, is an intangible entity which accompanies the human body for its entire lifespan. It controls the body and supplies it with human qualities, and human worth. Essentially the soul is an externalisation of certain brain functions and social conventions. Upon death, it severs all connections with the physical world and goes to God to be distributed as He sees fit.
The soul shares a category with Buddhism's karma and all manner of energies posited by New Age systems, in that although it's credited with many effects (for example a person's conscience), none can be attributed to it unambiguously. Associating it with the ordinary, observable energy inside the body is one way to make it sound more plausible, but there's no merit in the comparison.