Quicksand

All Music Guide:

The alternative metal band Quicksand emerged from the New York City hardcore scene of the late '80s; before coming together in 1990, singer/guitarist Walter Schreifels, guitarist Tom Capone, bassist Sergio Vega, and drummer Alan Cage all honed their chops in a series of local acts, including Youth of Today, the Gorilla Biscuits, and Bold and Beyond. A self-titled EP soon followed, and in 1992, Quicksand issued their Polygram debut, Slip, earning airplay with the single "Dine Alone." After touring in support of their sophomore effort, 1995's Manic Compression, the group disbanded, only to attempt an unfruitful reunion two years later before going their separate ways once more. Quicksand's former members have since cropped up in other outfits (Capone in Handsome, Schreifels in Rival Schools, etc.), and although they never broke out of cult status over the course of their two-album-long career, Quicksand's influence can still be felt, especially on such bands as Grade, Absolve, Thursday, and At the Drive-In, among others.

Wikipedia:

Quicksand is a colloid hydrogel consisting of fine granular material (such as sand or silt), clay, and water.

Quicksand forms in saturated loose sand when the sand is suddenly agitated. When water in the sand cannot escape, it creates liquefied soil that loses strength and cannot support weight. Quicksand can be formed in standing water or in upwards flowing water (as from an artesian spring). In the case of upwards flowing water, seepage forces oppose the force of gravity and suspend the soil particles.

The saturated sediment may appear quite solid until a sudden change in pressure or shock initiates liquefaction. This causes the sand to form a suspension and lose strength. The cushioning of water gives quicksand, and other liquefied sediments, a spongy, fluidlike texture. Objects in liquefied sand sink to the level at which the weight of the object is equal to the weight of the displaced soil/water mix and the submerged object floats due to its buoyancy.

Liquefaction is a special case of quicksand. In this case, sudden earthquake forces immediately increases the pore pressure of shallow groundwater. The saturated liquefied soil loses strength, causing buildings or other objects on that surface to sink or fall over.

Properties [edit]

Quicksand is a non-Newtonian fluid: when undisturbed, it often appears to be solid ("gel" form), but a minor (less than 1%) change in the stress on the quicksand will cause a sudden decrease in its viscosity ("sol" form). After an initial disturbance — such as a person attempting to walk on it — the water and sand in the quicksand separate and dense regions of sand sediment form; it is because of the formation of these high volume fraction regions that the viscosity of the quicksand seems to decrease suddenly. Someone stepping on it will start to sink. To move within the quicksand, a person or object must apply sufficient pressure on the compacted sand to re-introduce enough water to liquefy it. The forces required to do this are quite large: to remove a foot from quicksand at a speed of .01 m/s would require the same amount of force as "that needed to lift a medium-sized car."

Because of the higher density of the quicksand, it would be impossible for a human or animal to completely sink in the quicksand, though natural hazards present around the quicksand would lead people to believe that quicksand is dangerous. In actuality the quicksand is harmless on its own, but because it greatly impedes human locomotion, the quicksand would allow harsher elements like solar radiation, dehydration, carnivores, hypothermia or tides to harm a trapped person.

The way to escape is to wiggle the legs as slowly as possible in order to reduce viscosity, to try spreading the arms and legs far apart and lying supine to increase the body's surface area, which should allow one to float.

Prevalence [edit]

Quicksand may be found inland (on riverbanks, near lakes, or in marshes), or near the coast.

In fiction [edit]

People falling into (and, unrealistically, being submerged in) quicksand or a similar substance is a trope of adventure fiction, notably movies. According to Slate, this gimmick had its heyday in the 1960s, when almost 3% of all films showed someone sinking in mud, sand, or clay, but it has since fallen out of use. The proliferation of quicksand scenes in movies has given rise to an internet subculture scene dedicated to the topic.

In music [edit]

Pete Seeger's song "Waist Deep in the Big Muddy" mentions someone drowning after getting stuck in quicksand.