I was re-reading Future Guy's reveal at the end of Watching the Clock
, and something jumped out at me, on page 466:
"Improve it?" Daniels snarled. "One of your experiments in the twenty-fifth century led to a cataclysm that tore the Federation in half and left much of the quadrant impassable to warp travel! It sparked a new Romulan war that lasted for decades! If we hadn't been able to isolate that timeline..."
How does one isolate a timeline? Do the 30th century time cops have a technological means of preventing a newly-made history from merging with and overwriting the old? Or was it intended to mean that a mission to repair the damage was undertaken?