How does mr.bittering plan in getting his family back to earth?

Mr. Bittering plans to get his family back to Earth by building a rocket using the materials available on Mars. He believes that if they can gather enough resources and construct a functional spacecraft, they can escape the planet and return home. However, his plans are complicated by the psychological and environmental changes that affect his family as they adapt to their new Martian life. Ultimately, his determination to leave is challenged by the realities of their situation.