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The Borealis is a lost mysterious ship originally owned by Aperture Science before they lost funding to Black Mesa. It's stranded in the ice in the North with its drydock and a mysterious weapon.

The Borealis was originally to be part of the Half-Life 2 Half-Life 2 storyline, but it was scrapped.

Portal in Half-Life Continuity

Borealis as seen in HL2: EP2

This is a picture seen at the end of Half-Life 2: Episode Two. There is a container labeled Aperture Science, so there definitely is a link between the Half-Life universe and Portal.

See also