Lyric discussion by JamieUnicorn 

Cover art for Sea People lyrics by Emilíana Torrini

Maybe Sea People are people in love.

For me she's speaking from the outside, the end, of a relationship; perhaps about someone she still loves and would like to be with again ('can you ever see me as you did before?').

She drowns without that person. She's on the outside of love, no longer a sea person.