The Thetians started building ships when they were driven out of their homland by Ri'ksaad. They turned to the sea and built the ships.They started with small skiffs to search to coastland for a place to settle, but once they realized there was no room for them they built bigger seafaring ships that could hold all of the Thetians. They set sail and discovered the Thetis Isles, where they settled down.
Thetian ships are the most well made anywhere. The Thetis Isles makes a lot of money off selling their superb ships to captains and explorers.