This is simple and expressive. I like the theme and how you have portrayed it. The expanse of expressions and interpretations out of this can be huge - not necessarily a good thing so I cannot decide if any further addition would have made this more interesting and pleasurable to read or would have diminished its feel.
This makes me wonder so many things, what caused them to go into the ocean in the first place, why it's not the right time, what they're going to do now ..... beautiful capture of a moment. The ambiguity of the circumstances magnifies this part of the bigger picture (if there is one).