Water under tension in a Berthelot tube has been studied by high-speed photography and neutron diffraction.
The water was cooled below the normal ice-nucleation temperature and was in a doubly-metastable state prior to a collapse of the liquid state. The observed pattern does not exhibit the usual crystalline pattern of hexagonal ice [Ih] that is formed under ambient conditions, but indicates the presence of other ice forms. The composite features can be attributed to a mixture of amorphous ice, ice-Ih/Ic and the high-pressure form, ice-III, and the diffraction pattern continues to evolve over a time period of about an hour.
Read this ‘HOT’ PCCP paper:
Studies of cavitation and ice nucleation in ‘doubly-metastable’ water: time-lapse photography and neutron diffraction
Matthew S. Barrow, P. Rhodri Williams, Hoi-Houng Chan, John C. Dore and Marie-Claire Bellissent-Funel
Phys. Chem. Chem. Phys., 2012, DOI: 10.1039/C2CP41925D