What are the rules for saving people on the merchant ship map in Flash Point: Fire Rescue?
The idea is that the stairs effectively split the top spaces into two - see the designer's comment at https://boardgamegeek.com/article/14049646#14049646 . On that basis I would regard the top spaces as accessible only via the stairs.

At the bottom I'd regard e.g. (6,0) as the rescue space and (5,0) as where you go on your way out of it. On the other hand explosions (or Chop actions) can connect the bottom spaces to the cabins (e.g. linking (6,0) to (6,1)).