Final answer:
Christopher likely pursued a career in biomedical engineering, using his personal experience to inform the development of compact, life-saving medical devices for use in maritime settings.
Step-by-step explanation:
Given Christopher's experience with the lifesaving potential of a defibrillator during a maritime emergency and his determination to create a compact defibrillator suitable for all maritime vessels, it is likely that he pursued a career in biomedical engineering.
This field involves the application of engineering principles to the medical field, including the development of medical devices like defibrillators. Biomedical engineers work to design, test, and manufacture such devices to improve patient care and safety, including the creation of more portable and accessible lifesaving equipment.