Name of 90s Nickelodeon Show?

I watched this show growing up. I think it was on Nickelodeon. It featured kids transporting or warping through tubes. That's all I can remember. It was probably a half-hour drama. I don't remember if they were saving the world from bad guys. I just remember they teleported. I also don't know if the show was syndicated and it aired on Nickelodeon as reruns. I'm thinking it aired anywhere from 90 to 97.