Things you may not have noticed (spoilers ahoy!)

[felixmole]

Spoiler below!

• The robot head girl says things like "Away", "Don't come any closer", etc. as the player moves in her area.
  
• After entering Tau, you can hear "Caution, airlock pressurizing". When moving forward to the rooms located on the side further ahead, and then backtracking towards the entrance through the hallway, you can see the airlock door opening for Johan Ross.