The profound depths of the sea are forever shrouded in mystery in the eyes of land-dwelling races, much like the dense fog beyond the navigation hazard line that hinders one's sight. When the sea is calm and peaceful, there may be wild currents swirling beneath the surface. When stormy waves rage on the surface, the underwater world usually remains serene, undisturbed by the turmoil above.
Compared to the surface, the deep sea is like another world. There are no seasons, no high-hanging sun or moon, no bothersome rain, snow, or storms - many things people take for granted on land don't exist in the depths of the ocean. The breath of air, scattering scent, sounds carrying through the air - with these elements removed, people often find themselves lost in the underwater realm.