When the father and son discover the boat, boat should be loaded with machine guns and hand grenades. Also, smart sharks.
In book, they say "carrying the fire" and it's some kind of abstract thing about carrying the spirit of humanity around in a time of hopelessness. Afraid people will not get. What if "fire" is a secret weapon that will restore atmosphere and kill the robots? Or it turns out at the end that boy can shoot fire out of eyes and mouth? He's like a messiah guy, but a fire-shooting-eyes messiah guy.
Read the whole thing.