Unmanned Underwater Vehicles Market by Type (Remotely Operated Vehicle (ROV) and Autonomous Underwater Vehicle (AUV), Product (Vehicles, High-capacity Electric Vehicles, Work Class Vehicles, Heavy Work Class Vehicles, Man portable, Light Weight Vehicles, and Heavy Weight Vehicles), and Application (Commercial Exploration, Defense, Scientific Research, and Miscellaneous): Global Opportunity Analysis and Industry Forecast, 2020-2027