Why do you assume computers would've needed to be involved? One can plot space-time warping by hand. Indeed, Einstein had no benefit of computer assistance in developing his theories of relativity and gravity warping.

Why assume a complete theory of black holes or wormholes was necessary? Clearly the concept existed. Clearly we had General Relativity. One could imagine a more speculative but still physics-based visualization of what might happen in traveling through such a nexus of space-time.