Instead, water network is flexible and adaptable upon changing conditions. This extraordinary attribute yields to 19 conformations of the water network with varying orderliness and crystallinity, including crystalline ices, amorphous ices, and gas hydrates. The flexibility of H-bonds allows the water network to accommodate small hydrophobic molecules without sacrificing H-bonds, which is the underlying principles of gas hydrate formation. Water network cannot accommodate large guest molecules without losing H-bonds. Computational studies showed that for smaller cavity, the density fluctuation follows gaussian statistics as the perturbation rem ains linear, whereas for larger cavity it starts to deviate (Fig ). Consequently, the threshold classifying small and large guest molecules is described as a crossover length-scale, which is ~1 nm as per theoretical calculations (Fig ) .