Hahaha, have to admit I saw it this way too.
You have to go to great lengths to marry the merman of your dreams.
If you can't tell because of the ocean surrounding us, I'm crying for joy right now.
At first glance I was like, THE BUILDING IS FLOODING, "STOP FACE-EATING AND GET OUTTA THERE!!" ... And then I was like, "oh they're under a dock."