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Aside from the obvious danger of getting lost in the fog, the major fear is the quicksand-like glacial silt that comprises the mud flats. Much like quicksand, the more you move, the deeper you get stuck.
The silt washes down from the glaciers in the mountains at an alarming rate. The water is completely opaque from the silt content. When the silt is still and resting, it can be as solid as concrete.
Microscopically, the silt particles are in a delicate, loosely oriented pattern while mixed with the water. When disturbed buy a human foot, these particles resettle into a more tightly packed arrangement.
Once you have gotten stuck in the mud, it is very difficult to get out. Local rescuers have a water pump to help with mud rescues, but it is always a race against the tide.