The following are random out of order facts I found interesting in the linked article:
The threshold for infrasound is around 140dB at 20Hz increasing to about 162dB at 2 Hz and to 175-180dB for static pressure.Due to the ethical issues regarding testing human subjects, experiments on dogs were conducted at levels of 170dB at a frequency of 0.5 Hz. Curiously the dogs stopped breathing because of lung ventilation due to the high intensity pressure changes, although the 0.5 Hz frequency of the sound acted as an artificial respirator and the dogs showed no ill effects afterwards.Many of the most profound effects of sound are attributed to infrasound in the region of 7Hz. This corresponds with the median alpha-rhythm frequencies of the brain.It is also commonly alleged that this is the resonant frequency of the body's organs and hence organ rupture and death can occur at high intensity exposures.
Any severe extreme imposed on the sonic environment has a profoundly destabilizing effect on the individual. This becomes evident in both the areas of high intensity acoustic energy and also its complete absence. Anechoic chambers, which create an environment void of sound, have the ability to produce similar feelings of disorientation and disturbance that are evident with high intensity sound. The silence envelops the individual in a suffocating manner causing both psychological trauma and also physiological disturbance in the form of balance and other related body function.