I seem to remember that in Pastwatch: the Redemption of Christopher
Columbus they managed somehow to carry forward into the new timeline
some hint of the timeline (our timeline pretty much) they were about
to destroy when they altered the past. Anyone remember what they
did? Doesn't seem possible.
Maybe I'm "misremembering" as Clemens might say. (I loaned the book
and never got it back or else I would simply look at the last
chapters.)