Sea Dragon
The most obvious improvement that differentiates Sea Dragon-2 ROUV from Sea Dragon-1 ROUV is that Sea Dragon-2 is almost as twice fast as Sea Dragon-1 ROUV in reaching the maximum operating depth of 3,500 meters: it would only take less than 30 minutes for Sea Dragon-2 ROUV to achieve so, as opposed to nearly 50 minutes for Sea Dragon-1. Other physical characteristics and performance parameters remain the same as that of Sea Dragon-1, but reliability, maintainability and availability are improved for Sea Dragon-2, based on the feedback from the service of Sea Dragon-1. It is reported that due to such improvements, the planned series production of Sea Dragon class ROUV would be only consisted of Sea Dragon-2 ROUVs.