This is my second remake of a piece of music originating from The Guardian Legend. It's an underrated gem of an NES game, that I sincerely recommend you watch, and play if you have the chance.
The titles for this song vary. Some call it 'Deep Blue,' some call it 'Snowy Fields.' I'd noticed that this overworld theme existed in tandem with some of the underwater stages, so I decided to take a leaf from that.
Inspiration also came from Metroid: Fusion, where you had a zone 4: AQA section with walls of water surrounding you, and a high-pressure glass tube that shielded you from the surrounding water pressure. I tried to imagine what that would sound like. If The Guardian Legend were remade today, I imagine that they'd take something like this into account, where you see the water around you, and all the creatures within it.