Sunken ships, lost treasure, and underwater adventure! Maple Tree arrives on the eighth stratum to find a whole new world under the sea. Theyll have to dive deep to explore and master fighting in the water. Maples defense build isnt designed for the speed and agility required to swim, but shell find a way! Thankfully Sallys already a skilled swimmer. With her help, the rest of the guild heads out to find what awaits on the ocean floor-and what lurks in the dark depths...