Lyric discussion by hseagraves 

OK if this song is about an actual nautical disaster, could someone please explain the last few lines?

Then the dream ends when the phone rings, you're doing alright he said it's out there most days and nights, but only a fool would complain. Anyway Susan, if you like, our conversation is as faint as a sound in my memory, as those fingernails scratching on my hull.

What conversation in relation to an actual nautical disaster? Who's Susan? What dream? What conversation?

I think anyone who has had to let someone go to save themselves would understand what this song is about.

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