| UNDERWATER ADVENTURE BOAT CO. LIMITED | Private company limited by shares | Live |
| Shenzhou Underwater Engineering Technical Advisory Services Limited | Private company limited by shares | Live |
| UNDERWATER WORLD CHINA LIMITED | Private company limited by shares | Dissolved |
| Sea Dweller Underwater Academy Limited | Private company limited by shares | Live |
| Ningbo Far-East Underwater Engineering Co., Limited | Private company limited by shares | Dissolved |
| DALI Underwater Engineering HK Limited | | Live |
| POTENT UNDERWATER ENGINEERING LIMITED | Private company limited by shares | Live |
| HONG KONG UNDERWATER ASSOCIATION LIMITED | Company limited by guarantee | Live |
| HONG KONG CHINA UNDERWATER ARCHAEOLOGICAL EXPEDITION SOCIETY LIMITED | Private company limited by shares | Dissolved |
| Hong Kong Underwater World Mixed Juice Seafood (China) Catering Group Co., Limited | | Live |
| HONG KONG UNDERWATER RESORT INTERNATIONAL GROUP LIMITED | Private company limited by shares | Live |
| Hong Kong Underwater Performing Arts Association Limited | | Live |
| China Hong Kong Dragon Power International Underwater Technology Consultant Service Limited | Private company limited by shares | Live |
| HONG KONG UNDERWATER TOURIST LIMITED | Private company limited by shares | Dissolved |
| Scuba Monster Underwater Photography Company Limited | Private company limited by shares | Live |
| Underwater Plus Production Limited | Private company limited by shares | Live |
| UNDERWATER EXPLORATION PRODUCTIONS LIMITED | Private company limited by shares | Dissolved |
| Underwater Scooters Limited | Private company limited by shares | Live |
| UNDERWATER TECHNOLOGY INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| UNDERWATER WORLD LIMITED | Private company limited by shares | Dissolved |
| YEHO UNDERWATER RESORT LIMITED | Private company limited by shares | Live |