Nautali start their technology at TL 2 (Renaissance/Age of Sail)
- Nautali come to TL 3 by the 1600s (Industrial Revolution/1700s)
- TL 4 by the 2600s (Mechanized age Victorian 1880s-1909)
The surface world starts technology at TL1 (Bronze Age)
- TL1 (Iron Age) by 1000
- TL1 (Medieval) by 1800s
- TL 2 (Age of Sail) by 2700s
- TL 4 (Mechanized Age) in 3200
Everyone goes to TL 5 (1910s) by 3250s
- TL 6 (1940s) by 3290s
- TL 7 by 3320s
- TL 8 by 3350s
- 2752 NC: Fireworks
- 2801 NC: Gun on the Battlefield
- 2783 NC: Movable type for the Ferrous language