The main conflict in the story was a man vs nature conflict. Andrew Ryan did not want to live in a world where there was the constant threat of nuclear war. This is the whole reason why he creates Rapture.
oh god she got Bob
stand down we don't want anyone else to get hurt
He decides he isn't going to live in a world where he doesn't feel safe, and he is going to make a new world. He starts to recruit people he can trust to help him build his new underwater utopia.
Once he gets the best carpenters, engineers, plumbers, and more than he can find including his right-hand man Bill they start to construct the underwater city.
is daddy ok?
he will be fine this is what he wanted
Frank Fontain made ADAM and EVE, a serum that makes you more powerful, people started to get addicted to it and killing other people, mostly people that followed Ryan. With Ryan making all the wrong moves many different rebel groups form and go against Ryan and his ideas. Bill does not like what is happening, in his mind its no place to raise a kid.
Bill and his family decide they are going to attempt to escape Rapture and come up with a plan on how they can get out without being caught by any of the security systems.
we can get out through the lighthouse it will be dangerous but we can do it
Bill is executed by Ryans request but he dies easy knowing that his family is on their way to a new, better life.