And the sea up underneath get so deep
B.o.B. continues with the water theme here, that is present through the entirity of the album. Imagine getting dragged out to see by an undertoe, the tides continue to get higher, sea underneath keeps getting deeper, and the stakes are the highest they’ve ever been (for him and everyone he’s singing about in the song).
To fight for who you are and can be, swim and live; or give up on yourself, sell out and drown.
Think about this metaphor anytime you hear him mention the water throughout the album.
To help improve the meaning of these lyrics, visit "Both of Us" by B.o.B (Ft. Taylor Swift) Lyrics and leave a comment on the lyrics box