Soviet scientists developed a technology supercavitation torpedo called “Shakval” during the cold war; the size of the bubble is limited to a speed of 370 kmpH or more. But there is a problem with this technology, which caused water drag.
To obviate this problem Chinese scientist team at Harbin Institute of Technology’s Complex Flow and Heat Transfer Lab developed a new technology called “Supersonic Supercavitation” that means they found a way to generate air bubble bigger than previous technology, significantly reducing friction of large underwater vessels.
A supersonic submarine vessel travels underwater from Shanghai to San Francisco in 100 minutes, which could cover 9,900 km with the speed of beyond 1,225 kmpH (761.2 mpH).
Li Fengchen a professor of fluid machinery (Chinese scientist) said “If a swimsuit can create and have many tiny bubbles in water, it can significantly cut down the water drag; swimming in water could be as effortless as flying in the sky.”