Borealis

Borealis is a VR game prototype in the Half-Life series that was being developed by a small team at Valve from mid to late 2015. Marc Laidlaw aimed to create a game which took place on the Borealis, the Aperture Science research vessel that was glimpsed in Half-Life 2: Episode Two and implied to be a key story element in the future of the series. Players would explore the vessel as it ricocheted backwards and forwards in time between the Seven Hour War and a time set after the events of Episode Two. A mini-game where players could fish off the bow of the ship was also discussed. Ultimately, Borealis did not gain enough traction for its developers to be able to justify continuing work on it, and Laidlaw retired from Valve at the end of 2015.