Fire crews gathered on the Brayford on Thursday morning, but fortunately they were not responding to an emergency.
Crews from Lincoln North and South were spotted around Wigford Way near the Brayford on Thursday, May 2.
The were seen pumping water from and into the Brayford Pool.
Groups of people stopped to watch the rare opportunity to see fire crews in action.
A spokesperson for Lincolnshire Fire & Rescue told The Lincolnite the crews were carrying out training drills.