Note: the nature of time itself in Building 17 feels a little finicky, so this timeline is speculative at best.

  1. Sumner, Mundusa, the Director, and other members of the League of Cartographers journey between dimensions using the Carta.
  2. Something goes wrong and Sumner’s team members are trapped outside of spacetime in the Endless Shore, maybe becoming the Echo.
  3. The Silent Ocean and the Echo, a manuscript from the Office of Endings, is leaked and published by Castlewood Glade.
  4. Sumner joins Cygnus Solutions Inc., run by Cygnus Halloway, possibly hopping timelines to do so.
  5. Sumner constructs the Eye, a window into the Endless Shore.
  6. 1985: Echo meets Bniton, the author of TSOaTE.
  7. 1989: Oddvar, Beechum, Halloway, Sumner and Laybeth Expedition to Hornsundind. Samples containing Endless Ore are discovered, such as the C. Halloway S2 gemstone.
  8. 11:23 PM, September 13th, 1989: Utilizing samples taken from Oraefajokull and “resynchronizing the harmonies” of the gemstone, Halloway gains access to the Endless Shore, a metaphysical space between dimensions.
  9. 11:59 PM, the same day: The Syphon is used to link to the Cygnus Thicket, the first location in the Endless Shore discovered; it takes the team longer than expected to return
  10. Once a stable connection is established to the Endless Shore, the Echo is discovered haunting certain Cygnus Solutions Inc. equipment.
  11. August 24th 1990: The Cygnus Coast is discovered and explored.
  12. September 21st 1992: The Cygnus Desert, the 5th such location to be sourced from the Endless Shore, is discovered and explored.
  13. Sometime between 1989 and 1992: The Buildings are designed and constructed (or found?)
  14. 1994-1995: The League of Cartographers (seemingly) acquire the Whitstrine Quartz from a mining convention in Blessing, Texas.
  15. Cygnus Solutions Inc. moves into Building 1 due to running out of space at HQ, and later the other Buildings.
  16. Building 17 is founded by Halloway, Sumner, Oland, and Matsumoto.
  17. Mundusa and the Director are “recovered” from the Endless Shore.
  18. September, 1996: Halloway’s beta AI terminal goes offline.
  19. At some point, Halloway is lost.