Something like this:

https://www.livescience.com/dark-energy-could-lead-to-a-seco...

If the ends of the spaghetti can never reach each other after space's rate of stretching passes the speed of light, then the spaghetti can never reach the pit. If the spaghetti never reaches the pit, then everything in the black hole falls forever. If everything falls forever, then the clock outside the block hole is synced to the clock of particles falling inside the black hole.

Which suggests that a black hole forms an infinitely deep funnel, and if we entertain the idea that the rules of our universe keep working inside it, an hourglass.

What does that look like? On Earth, space pours down our gravity well, reaching a stagnation point sometime before the center, which forms an indentation in spacetime which we ride in as we orbit the sun.

In a black hole, there's still a stagnation point, if we consider the entire life of the black hole, including final evaporation. The bottom of the indentation falls at the speed of light, but eventually slows and rebounds as the black hole begins to shrink due to Hawking radiation, then springs back into our reality. In other words, the space inside a black hole is more dynamic than where we are.

We're normally shown a picture of that falling floor tearing through our spacetime into an unknown place. But since the space is falling faster than the speed of light, I think that it crosses over itself and diverges, forming a white hole on the other side. The math of that white hole matches the math of the Big Bang. So we can picture the child universe as starting just like ours, and forming a sphere in the bottom of the hourglass expanding faster than the speed of light until its density gets low enough that the expansion proceeds at merely the speed of light. The same way that inflation worked in our universe.

Particles at the edge of the sphere are able to leak back into the parent universe via Hawking radiation just like our galaxies at great distance slip out of our universe red-shifted faster than the speed of light. So the mass of the sphere begins to shrink, which slows its rate of expansion. Eventually its space starts to contract, [turning the child Hubble constant negative] <- edit: increasing its Hubble constant even higher. Everything begins to contract back towards one another. The edge of the sphere eventually rushes back inwards at the speed of light, creating a Big Crunch.

It's not that matter is crushed together, but that space is contracting so fast out from under it that it has nowhere else to go but back up out of the throat. The final pop is reverse spaghettification, as each particle is torn apart back to quarks, electrons and energy back into the parent universe. The hard part to visualize is that the crunch happens inward towards each particle simultaneously, there is no center.

The quantum mechanical aspect and notions like the Planck length are probably a distraction. An electron is always a point charge roughly the size of its uncertainty, in any spacial coordinate system. Maybe it has more mass and is a muon or tau (or something heavier), but it never stops being an electron fundamentally. When it spaghettifies in the throat, its wave function only has 2 degrees of freedom, along the radial axis and rotation, with the third degree along the time axis. Until space diverges again in the white hole on the other side and it's able to exist in 3D again.

So our universe is the white hole on the other side of the black hole in the parent universe, and the universe is infinite, looking like swiss cheese with child universes and more black holes inside the bubbles. The centers of atoms may act like miniature black holes, but with slightly different rules involving the electroweak force and probability, creating an emergent force which we think of as the strong force.

It's universes all the way down.

This is the best mental model of reality that I've stumbled upon, but I'm sure it's wrong in important ways.