A large section of Cardiff Bay Link Road in Cardiff, Wales was closed off for Doctor Who filming late Sunday night, February 10 for a night shoot.

One person at the scene captured a photo of the filming involving automobiles, one with a camera mount.

#dwsr They've been filming some kind of car chase/road scene within the Cardiff Bay Link Road tunnel. There is a whole area set up outside the tunnel by the queensgate roundabout which is where I assume they will move onto next. No cast spotted. pic.twitter.com/88vuG3DToO

— On Location (@DWinCardiff) February 11, 2019

A large crane with a floodlight illuminated the scene.

#dwsr Filming is happening on a ramp just off queensgate roundabout pic.twitter.com/HtwiEWo6ES

— On Location (@DWinCardiff) February 10, 2019

Several Cardiff residents reported seeing the floodlight.

They're filming across the water. Probably Dr Who or something #Cardiff #CardiffBay pic.twitter.com/E6DR2HGETX

— Marcus Stead (@MarcusStead) February 10, 2019

The filming continued into early morning Monday, February 11.

One for Dr Who anoraks – 2:35am and they’re still busy filming in Cardiff Bay. #Cardiff #CardiffBay #DrWho pic.twitter.com/WBcv4rsnRi

— Marcus Stead (@MarcusStead) February 11, 2019

There is also a report of “seagulls” at the location. From what we understand, there were large birds resembling seagulls “floating” in the air at the filming location.

The “floating seagulls” could have been drones mounted with cameras for filming. Since seagulls are not an uncommon sight in Cardiff Bay, a person watching from a distance and unfamiliar with drones could possibly have mistaken them for birds.

https://twitter.com/ginoodle/status/1094779685198807045

The filming was for Doctor Who Series 12, which airs very early in 2020.

Prior to Sunday’s filming, a Doctor Who Series 12 crew wrapped on a three-week location shoot in South Africa.