I think it's pretty obvious that the song is about losing a loved one and the grief makes one wish everything turned to darkness as that is how they feel.
The line "No more will mine green sea go turn a deeper blue" means that there is no longer depth or deep meaning maybe. The green part of the sea is usually quite shallow and the dark blue parts are deep. That's what I understand from it anyway.
Every other line is just straight forward and obvious. Great song.
I think it's pretty obvious that the song is about losing a loved one and the grief makes one wish everything turned to darkness as that is how they feel.
The line "No more will mine green sea go turn a deeper blue" means that there is no longer depth or deep meaning maybe. The green part of the sea is usually quite shallow and the dark blue parts are deep. That's what I understand from it anyway.
Every other line is just straight forward and obvious. Great song.