MS ANT 1 was a ro-ro ferry operated by Stena Line between Larne, Northern Ireland and Fleetwood, England.

Initially ordered by Stena Line, the vessel was sold before entering service to P&O subsidiary Pandoro.

To cope with the increased traffic on the Fleetwood – Larne route the Bison was sent to the River Tyne in 1980 for lengthening.

On return from her B&I Line charter the Bison was rebuilt to meet the latest SOLAS requirements.

To cure this the Bison was sent to Cammell Laird in 1995 to have additional weight in the form of an extra vehicle deck added to the stern.