In a category of the three primitive FK phase in clathrate hydrates, the present discovery is the first in about 70 years, since the CS-II structure had been confirmed by X-ray diffraction in 1951 . After a series of explorations in conditions close to our living environment, the search for 25 new structures in water has been to keep the structure of water under extreme conditions, such as ultrahigh pressure on the order of GPa or high vacuum, and cryogenic temperatures. An unexpected outcome was that such primitive structure could be formed under conditions close to ambient temperature and pressure. As we have achieved this with ordinary laboratory setup such as flasks and test tubes in the lab, the future opens the horizon for ecological research and application development of materials that are within our reach.