[Davros]

SPOILER
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The buildings are actally the far terminus of teleport stations from the Trang and Umpani encampments - you can only open them from the inside.

If you've opeed the door in Trynton, the blue marble is history - it is common that the game won't let you drop items necesary to a task (you get THAT message) - it will however let you store it in a chest - use He'li or Antone.