Text this: Phase transition accompanied by transformation of an elusive discrete cyclic water heptamer to a bicyclic (H2O)7 cluster

  _____    __   __    ______    ______    _____   
 / ____||  \ \\/ //  /_   _//  /_   _//  |__  //  
/ //---`'   \ ` //   `-| |,-    -| ||-     / //   
\ \\___      | ||      | ||     _| ||_    / //__  
 \_____||    |_||      |_||    /_____//  /_____|| 
  `----`     `-`'      `-`'    `-----`   `-----`