Maybe try doing something like this:
I am not sure about materials, but man, your imagination is the limit.
Add a piece of black curtain in the pipe to get the effect of jumping between two different places.
Add simple arduino with motion sensor that plays warp sound every time you slide through.
You can also add some handles for a better slide.
But it kinda breaks the immersion. Well, you can always do a crawl, like a filthy animal.
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