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All 50 of Portal 2’s achievements have been posted over on Xbox360Achievements.org and one is entitled “Ship Overboard” with the description “Discover The Missing Experiment.” The keen folks over on reddit have made the connection between this and The Borealis which you may remember as a the wrecked ship mentioned in Half-Life 2: Episode 2 that housed some Aperture Science experiments gone awry (see video below).