Audio:
To make my game more immersive I did some research into what audio/sound effects would be most suited for my game which will give the essential experience I want players to feel.
Walking sound effect:
When walking around and exploring the environment, audio like this will play.
Heartbeat:
Fast heartbeat:
Background underwater ambiance:
This is what the background noise will sound like throughout the game. This is from a video I took whilst snorkeling which I converted to an MP3 file. I then altered the equaliser settings in Media Play.
Settings Used:

Website used to convert video to MP3: https://www.freeconvert.com/convert/video-to-mp3