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I'm looking for a book I read as a kid (somewhere around 1985-1990 and probably published before this since it was translated to my language). The title says pretty much all I remember about the book. However the memory has stayed with me for a quarter of a century, so I'm desperately trying to find out what it was.
Other things I remember are the aliens looking relatively humanoid (not very sure about this), the aliens capable of shaping their surroundings with the power of the mind and advanced medicine. I also think you were able to travel faster near the center of the tunnel, along a shaft of some kind(?). I know this is all very vague, but I'm hoping someone can help.
Oh, and I do not think it was 'The Way' by Greg Bear.