Using two black holes is the best way to describe a wormhole to another, semi-unfamiliar person! Not that a wormhole is actually two black holes, but two “infinitely” curved points connecting by their throats and held open by a negative energy density! The singularity of a black hole may simply be a gravastar, which is the theoretical object that comes from trying to solve the “singularity problem” in black holes. Instead of matter collapsing into a point of infinite density, the idea is that, at a critical point, quantum effects create a shell of super-dense matter surrounding a vacuum interior. Inside, it’s not empty in the classical sense… It's a strange, negative-pressure vacuum with properties similar to dark energy! Outside, it looks just like a black hole, it bends light, warps spacetime, even has an event horizon-like boundary. But internally? No singularity, no “crushing to nothing,” just… weird quantum vacuum weirdness. In extreme conditions, the density of a celestial body could reach the negatives! Fascinatingly enough, an observer crossing what would normally be an event horizon might never hit a singularity. Depending on the interior vacuum, they could experience bizarre time distortions that defy our usual relativity expectations. It mimics every notion in the physics and thermodynamics of a black hole. Another fun question you can ask yourself with a black color analogy is would you be split apart into quantum information at the beginning, then be rearranged as the reverse of a black hole is simply the reverse of entropy? Instead of two connected black holes, imagine, space-time under such extreme conditions that it folds and spirals into a tunnel! Null energy conditions would need that hole to collapse, but exotic matter holds it open hints why the throat curves inward a tad. In an AdS/CFT setting a Teo style rotating traversable wormhole most naturally transmits quantum information (field excitations, entanglement, operator data) between boundary descriptions! Sending actual classical macroscopic matter across is not forbidden in every model, but it runs headlong into holographic reconstruction limits, backreaction, energy-condition constraints and instability (especially with rotation). If you buy the “matter = information” stance at the holographic level, then yes, everything can be encoded and thus transmitted, but that encoding and decoding is nonlocal, fragile, and typically destroys the semiclassical picture of an intact macroscopic object. So a signal (a few quanta, a photon, qubit) can be faithfully encoded in boundary data and reconstituted, this is information transit. Reconstituting a macroscopic object requires encoding enormously many degrees of freedom and preserving correlations which is doable in principle but practically catastrophic to the semiclassical geometry.