Unlocking new in-game music tracks
After you've been to the Abyss for the first time, you'll unlock the song "Benedictus (Hayley Westenra)"

You can now select this song to play for any future dives.

Unlockable How to Unlock
Song "Benedictus" (Hayley Westenra) Visit the Abyss for the first time
"Hayley's Medley" (Plays all of Westenra's songs in a random order) Unlock all the other tracks.
"E Pari Ra" Go to "Ship's Rest" for the first time.
"Amazing Grace" Visit "Mo'ia Atoll" ruins.
"Hine e Hine" Cause the roof of the Ruins to cave in
"Pokarekare Ana" Free the bottlenose dolphin from the Lagoon
"River of Dreams" Enter the White Room of the Great Aqua Cave
"Shenandoah" Enter the Great Aqua Cave for the first time
"The Water is Wide" Watch the credits

Endless Ocean Secrets
View Staff Credits
When it's sunset in-game (after 6pm - use the clock in the boat's cabin to see the time), sit on the deck chair, and look out over the horizon as usual to view a special cut-scene with Staff Credits.