Group 1 - The term "frogman" refers to trained personnel assisting in the deployment and recovery of manned submersibles like "Fendouzhe" and "Deep Sea Warrior" [1][2] - The deployment and recovery operations are conducted under challenging sea conditions, with "Fendouzhe" operating in level 4 (wave height 1.25-2.5 meters) and level 5 (wave height 2.5-4.0 meters) sea states [2] - Frogmen face significant risks during operations, including the potential for being submerged by waves and encountering marine life such as sharks [2] Group 2 - The operations require coordination among multiple departments, including ship navigation, command personnel, and A-frame operators, highlighting the importance of teamwork [2]