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Is Supersonic speed of underwater vehicle a reality? (exploring options)

In Travel, travelling, Water Technology by Maz

There are certainly underwater supersonic vehicles. However, they are not an exact vehicles that carry passengers. We may come across missiles that some nations around the world test. However, there has been no release of any news related to supersonic passenger underwater vehicles. There are no known underwater vehicles that can travel at a supersonic speed. Speed at which a …