The deepest, darkest and most treacherous part of the sea is accessible to wanderers with this new update. Players will be able to explore the deep sea caves in the Dark Well. In order for Wanderers to dive deeper into the mysterious sea, they will have to upgrade their equipment during prerequisite missions in order to survive the massive water pressure of the Dark Spring. In addition, two puzzle missions are available - "Patrol Guard Trapped" and "Inactive Eternal Guardian". Also, new in Sound of the Sea: the difficulty level increases with the dimension, instead of the Wanderer level. Not only do the enemies become more powerful, but the rewards for solving puzzles and from chests are also improved. Abyssant: Nakya, a massive new world boss which looks like a spider skeleton, also makes an appearance.

The update to Sound of the Sea not only provides wanderers with a new world boss, map, and challenges, but also a new physical simulacrum, Gnonno. Inspired by her grandfather Nuok, who was part of the exploration team that discovered Innars, Gnonno hopes to become an excellent explorer as well. However, her reputation as a troublemaker and wild person sometimes gets in the way. Although she knows the complex seas like no one else, a few years ago she convinced her best friend to go exploring with her, but only Gnonno returned home. Many mysteries shroud the incident, but one thing is certain: Gnonno has gained the power to summon a strange octopus-like creature and control its tentacles. Moreover, during her explorations she wields a special weapon, the mini whirlwind.