Beneath the Ocean, Within the Soul

Prologue (Introspection): Prologue, and Sana's theme.
Subaquatic Saunter: This serves as an overworld theme when traversing the ocean.
Subaquatic Saunter (Action): Dynamic track for when doing puzzles or fighting enemies.
Within a Bubble: Save zone theme. Take a break!
Mechacanthine Foreboding: Transitional theme when approaching boss strongholds.
Mechacanthine Chaos: Boss theme.
Epilogue (Within the Soul): Epilogue, and variation of Introspection, as Sana realizes what she was missing.