Sure it is! Black holes have so much of a gravitational pull, that they warp space and time until it tears, and creates a "tunnel" with a different part of our universe or a different time. Unfortunately, black holes will likely crush most humans trying to enter them. There is one exception though. If the mass of the black hole is in a ring shape, and if one is really lucky, the gravity inside the loop might not be enough to crush you, and you would still be able to cross through the "tunnel" But, the energy required to make such a very specific black hole is more than humans will probably ever be able to master. So, while it is theoretically possible, it is not likely that it will ever happen.