140 days... That's tons of time.
I'd take some of that air and put it into my space pack. Then I'd leave the hatch and start swimming for home.
Upon reaching the earth's atmosphere and breaking through the clouds, I'd initiate a somersault rotation with a half suplex twist, forming into the pike position and plummeting into the Mediterranean with a barely audible "sploop".
The French chicks would go wild as I bobbed onto the beach and then I'd say "I'm not a hero - I'm just doing my job."