|This article is written from the Real Life point of view|
Sector 4 (AQA) Aquatic Control Level Area (セクター4（AQA) 水位制御エリア) is the theme that plays throughout the upper area of Sector 4 in Metroid Fusion. It is also included in the Metroid Fusion Arranged Version medley heard on the Metroid Prime & Fusion Original Soundtracks. It is much less brooding compared to the later Sector 4 (AQA) Underwater Area theme heard in the depths of Sector 4. It was composed by Minako Hamano and Akira Fujiwara.