Layers of Metaphor in "T is for Time"

"Take risks, Marcus.  Try new things, Marcus."  Fuck you, Eva.  

This short film is quite brilliant for its layers of metaphor and complexity.  Marcus goes scuba diving on impulse, mainly because he needs a friend to be with.  It's an odd friendship, though, as the two seem to be of wholly different personalities and alcohol tolerance.  But trapped in a relationship, he finds the underwater to be rather liberating.  Except that he gets trapped in a cave.  Either the scuba diving happened literally, or it's a metaphor to give us a visceral, frantic sense for Marcus in this relationship.

Trapped, just like Eva...  You're free now.  

Marcus sits on a chair in the bedroom, looking rather distraught, a time piece and chain on hand.  As he walks to the bed, we see Eva and her lover, naked and sleeping.  But are they merely sleeping?  Marcus lays the time piece carefully to her side, as if to say `Your time is up.  Did he kill both of them, rendering sleep as both an actual thing and a metaphor for death?    

Perhaps Marcus killed himself as well, which makes the scuba diving, and being trapped in that little cave, a perfect rendition of the experience of dying.