While you are in Aperture Innovators, you come across the control room. While you walk in there is a corner with a hidden door that you can walk through to find a corridor that leads to one open door on the right. Walk through it to find a ship-wreath that read "BOREALIS" (that's what I call them so deal with it) When you first found this you probably thought nothing of it. But did you know that the Borealis is a lost ship that disappeared years ago only to be found in aperture. Then, the ship disappeared again and is found in a monitor during chapter 1 of Half-Life 2.