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As a reply to Alayna's question about the quote, "there is only under water in Louisiana", I agree with Jess in the interpretation of the quote. "There is only under water" might be a metaphor for Caroline and her life. Everything in a sense is drowning her as if she is "under water"

She feels weighed down by either her job, her kids, and the loss of her husband. In a sense she is underwater figuratively and literally(under sea-level).