Combined submersible vessel and unmanned aerial vehicle

A flying submarine, comprising:

• a body structure including a hull;
• at least one wing structure coupled to the body structure;
• at least one horizontal stabilizer structure coupled to the body structure;
• and
• a propulsion system coupled to the body structure and configured to propel the flying submarine in both airborne flight and underwater operation, wherein the propulsion system includes:
• a motor;
• a gearbox coupled to the motor and configured to receive power generated by the motor and provide variable output power;
• a drive shaft coupled to the gearbox and configured to transfer the variable output power provided by the gearbox, the drive shaft being a hollow shaft;
• a propeller coupled to the drive shaft and configured to accept power transferred to it from the drive shaft, and further configured to rotate and propel the flying submarine in both an airborne environment and in an underwater environment;
• and
• a rocket propulsion system having an exhaust tube concentrically located within the drive shaft.