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For a while.. the mathematics seemed to imply that if you hit a black hole *just right* (and it was the right kind of black hole), you could pass through unmolested and jump to "another universe" or some arbitrary point in time-space.
That was before the gritty parts of blackholes and the fact they rotate really fast was incorporated into the model. Turns out there's so much debris around a black hole - good luck with surviving that. Then there's the differential gravity that would spaghetti you and your ship. Oh, you'd go through.... but all the information associated with you would be destroyed.
Usually theories go through all sorts of revisions as they're being hammered out. Sometimes really interesting science fiction comes out of those transitional understandings -- sometimes interesting science documentaries. But laypeople don't often pay attention to the "this understanding is conditional and may change as we learn more". They just grab the model of the moment and take it as fact, and never check back in to see whats up.
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