Diagram for a wormhole

It seems that any naturally occurring transversable Kerr wormhole would most likely connect two different times. If an advanced civilization has discovered such a unique wormhole that could be utilized for our story, than the need arises to send that information back to the present to allow the use of it (again). Perhaps a diagram in a pyramid or an etching on rock during the Mayan civilization if times is a closed loop to that point, than the past may have already happened and the information could be made available to us. Certainly food for thought!