What is the sealand explanation of her country in the novel the chrysalids?

In the novel "The Chrysalids," Sealand is a technologically advanced society that appears at the end of the story. The people of Sealand have telepathic abilities and have developed a more advanced civilization compared to Waknuk where the story is predominantly set. Sealand represents hope for a future where differences are accepted and celebrated rather than feared and marginalized.