All those interesting videos of sea life happened because a Marine Engine Technician helped people travel the oceans. As a Marine Engine Technician, you inspect, diagnose, and repair marine and watercraft systems. These include gasoline and diesel engines, fuel management systems, engine electrical systems, marine electrical, electronic and navigation systems, steering and hydraulic systems, drives, and propulsion systems.  
 
More specifically, you will repair electrical and electronic marine engine systems, engine fuel management systems, and hydraulic, drive and propulsion systems. You will also perform engine tune-ups, repair engine systems, install engine and propulsion systems and winterize marine craft systems and accessories.