Rogue Raid on Scarif

After stealing the plans from the archive, some portion of Jyn, Cassian and Kaytoo’s escape from the archives involved a sequence shot in a London Underground station, in which they are chased down a long corridor by troops.
The Imperial Archives on Scarif and the Transmission Tower were separate structures. Jyn, Cassian, and other rebels had to run across the beach from one to the other under fire from Imperial forces once they had the plans.
Imperial Astromech C2-B5 was originally supposed to feature in some significant way, as evidenced by his many forms of merchandise. His appearance may have had something to do with droids having or not having personality from frequent memory wipes. He appears to have been a part of the run from the archives to the transmission tower.
Krennic was going to be on the beach in the aftermath of the battle, possibly walking towards the transmission tower.
Once atop the transmission tower, Jyn was confronted by a TIE Fighter.