A turtle and a parallel universe... Please help me find this movie!

I am looking for a movie in which a turtle was sent in a parallel world exploration.

I remember that this movie is set in a school / college laboratory where some students are doing this experiment: a turtle was sent forth and back to a parallel universe, using a teleport machine, and one day one of the students decides to enter in the teleport machine in place of the turtle to explore the world by himself...

I think that the movie was aired on 1998, I guess that it could be probably produced between 1994-1997...

Please, help me finding this movie! I was a kid when I was watching it and I couldn't see the final! :-)