Nice song...
It's a song about a man being into hell, fighting against the creatures and monsters just to get out of the neither world. After months of fighting and with the help of other creatures in which he made friends with from hell, he managed to escape from it and into a place we called earth. There, he began to write a book about his hellish experiences entitled "The World Below Ours" and share his experiences to others and never to follow down under.
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This just came to my mind after hearing the song. Great job dude :)