What Do Bodies Look Like After Being in Water?

A body recovered from water undergoes a distinctive sequence of changes that differs markedly from what happens on land. Within minutes, the skin on the hands and feet begins to wrinkle. Over hours and days, the body swells with gas, changes color, and may eventually form a waxy substance called adipocere that can persist for months or even years. The speed and severity of these changes depend on water temperature, salinity, depth, and the activity of aquatic scavengers, making every recovery scene somewhat unique.

The First Hours in Water

The most familiar early change is pruney skin. Within about 5 to 30 minutes of submersion, the fingertips and toes develop deep furrows. For a long time people assumed this was simple osmotic swelling of the outer skin layer, but research has shown it is actually driven by the nervous system. Wrinkling depends on intact sympathetic nerve signaling, and damage to those nerve pathways abolishes the response entirely.¹ The wrinkling is accompanied by constriction of tiny blood vessels in the digits, which is likely the main mechanism behind the visible furrows.² In a living person, the wrinkling reverses within minutes of drying off. In a dead body, the effect persists and deepens as the skin continues to absorb water over the following hours.

Beyond wrinkling, the body in these early hours looks relatively normal to the untrained eye. Skin color may appear paler than usual because blood pools toward the lowest points under gravity. In cold water, a body can remain in this relatively preserved state for a surprisingly long time. In warm tropical water, the transition to the next stage happens much faster.

Bloating and Color Changes

As bacteria in the gut begin breaking down tissue without oxygen, they produce gases, mainly hydrogen sulfide and methane. These gases inflate the abdomen first, then spread to the face, limbs, and even the scrotum or labia. The body can swell to roughly twice its normal size, and the pressure forces a dark, foul-smelling fluid from the mouth and nose. Skin color shifts from pale to green, starting at the abdomen where bacterial activity is highest, then progressing to a marbled pattern as the gas tracks along blood vessels beneath the skin. Eventually the entire body darkens to a deep greenish-black or brownish-black.

This bloating stage is what causes a submerged body to rise to the surface. A freshly dead body typically sinks, because the lungs fill with water and overall density exceeds that of the surrounding water. Once enough gas accumulates internally, buoyancy increases until the body floats, usually face-down because the gas concentrates in the torso. In warm freshwater this can happen within a few days. In very cold water it may take weeks, and in deep water the pressure can suppress gas expansion enough to keep the body submerged indefinitely.

How Water Type and Temperature Change Everything

Freshwater and saltwater produce visibly different results. In a pilot study comparing decomposition across environments, carcasses in saltwater decomposed much more slowly than those in freshwater. The likely reason is osmosis: freshwater is less concentrated than body fluids, so water moves into the tissues and accelerates swelling. That swelling eventually ruptures the abdomen, which attracts insects and further speeds breakdown. In saltwater, which is more concentrated than body fluids, this osmotic inrush does not happen in the same way, the abdomen stays intact longer, and insect colonization is delayed or absent.³

Temperature is equally important. Warmer water accelerates bacterial growth and enzymatic activity across the board. Research on organic decay in water found that decomposition rates roughly doubled when water temperature rose from 12°C to 18°C.⁴ For human remains, this means a body submerged in a warm lake during summer can reach an advanced state of decomposition in under a week, while a body in near-freezing water may remain recognizable for months. Interestingly, researchers studying bodies recovered from the Adriatic Sea found that their decomposition scoring models were not strongly influenced by season, suggesting that marine conditions introduce additional stabilizing factors compared to freshwater.⁵

Skin Slippage and the “Glove” Effect

After days to weeks in the water, the outer layer of skin loosens from the tissue beneath it. On the hands, this can cause the entire epidermis to peel away in one piece, an effect forensic professionals sometimes call “degloving” or “glove formation.” The same thing happens on the feet. Hair similarly loosens and detaches from the scalp. The underlying tissue is pale, soft, and extremely fragile.

This skin slippage creates practical problems for identification. Fingerprints, which are among the fastest ways to identify a body, sit on that detached outer layer. Forensic technicians sometimes carefully peel the loose skin from a recovered hand and slip it over their own gloved finger to obtain a usable print. In more advanced cases, the ridge detail is too degraded for this technique, and investigators must rely on dental records, DNA, or personal effects.

Adipocere Formation

One of the most distinctive things that can happen to a body in water is the formation of adipocere, sometimes called “grave wax.” It is a hard, grayish-white, crumbly or waxy substance that replaces the body’s fat deposits. The process occurs under anaerobic conditions when bacteria convert body fat into a mix of specific fatty acids with high melting points.⁶ The key compounds are hydroxy fatty acids, primarily 10-hydroxy stearic acid and 10-hydroxy palmitic acid, along with smaller amounts of oxo fatty acids. These are produced by bacterial enzymes acting on normal body fats, and their high melting points give adipocere its firm, stable consistency.⁷

Adipocere typically begins forming within weeks in warm, wet environments, but it can take months in colder water. Once established, it acts as a kind of natural preservative, maintaining the general shape and contour of the body long after soft tissue would normally have disappeared. Bodies encased in adipocere have been recovered years or even decades after death and still retain recognizable facial features, wound patterns, and other anatomical details. The substance is chemically stable enough that it resists further bacterial breakdown for extended periods.

Not every body in water develops adipocere. It requires sufficient body fat, the right bacterial community, an oxygen-poor environment, and enough time. Leaner individuals or those in fast-moving, well-oxygenated streams may skip this stage entirely and proceed to skeletonization instead.

How Bodies Come Apart in Water

As decomposition advances and connective tissue weakens, the body begins to lose structural integrity. Research on human remains recovered from aquatic settings has documented a fairly consistent pattern of disarticulation. The hands and wrists tend to separate first, followed by the feet and ankles, then the jawbone and skull. The lower legs, forearms, and upper arms detach next.⁸ This sequence reflects the relative vulnerability of smaller joints and extremities, which have less soft tissue holding them together and are more exposed to water currents and scavenger activity.

Currents, tides, and wave action scatter the detached parts, sometimes over considerable distances. A skull may wash up kilometers from the torso. This scattering is one of the reasons that recoveries from open water frequently yield incomplete remains. In marine environments, a further complication is bioerosion of exposed bone by organisms like sponges, which bore microscopic tunnels and chambers into the bone surface, increasing porosity and weakening the skeletal structure over time.⁹

Scavenger Damage and Postmortem Artifacts

Aquatic scavengers can dramatically alter a body’s appearance. Fish, crustaceans, and turtles all feed on submerged remains, and their activity can strip soft tissue far faster than bacterial decomposition alone. In controlled experiments with submerged carcasses, the presence of scavenging turtles reduced the time to complete disappearance of soft tissue from roughly 25 to 27 days down to as little as 3 to 6 days.¹⁰

The damage left by scavengers can create real problems for forensic investigators. Crabs and crayfish tend to feed on exposed soft tissue of the face, especially the lips, eyelids, and ears, producing ragged defects that can resemble wounds inflicted before death. Fish nibble at skin edges in a way that can mimic abrasions. Postmortem predation may cause external defects that look like injuries and need to be interpreted carefully to avoid wrongly concluding that violence occurred.⁶

Motorboat propellers are another source of postmortem damage that can confuse the picture. A floating body struck by a boat propeller sustains characteristic injuries: deep, parallel lacerations with a mixed sharp-and-blunt mechanism, where the spacing between the cuts corresponds to the distance between the propeller blades.¹¹ These distinctive parallel wounds can help investigators distinguish propeller strikes from other types of trauma, but on a heavily decomposed body even that distinction gets harder.

How Investigators Tell Drowning from Postmortem Submersion

Not every body found in water died by drowning. Some were dead before entering the water, whether from natural causes, homicide, or accident. Distinguishing between the two scenarios is one of the harder challenges in forensic medicine, because water erases many of the clues investigators rely on. There is no single test that definitively proves drowning.

One of the most useful tools is postmortem imaging. CT scans of drowning victims consistently show fluid in the airways, paranasal sinuses, and mastoid air cells, along with a hazy “ground-glass” pattern in the lungs. In one study of 28 drowning cases, all had fluid in the sinuses and lungs, and about 93% had fluid in the lower airways. Half had visible sediment in the airway, and roughly a fifth had frothy fluid.¹² CT scanning can also detect signs that are difficult to catch during a traditional autopsy, including bronchospasm, dilution of the blood by absorbed water, and fluid in the sinuses.¹³

When imaging alone is not enough, biochemical markers can help. Researchers have found that levels of a water-channel protein called aquaporin-1 differ significantly between lungs that actively inhaled water during drowning and lungs that were merely submerged after death. Combined with tissue-level changes visible under a microscope, these markers can improve the distinction between the two scenarios.¹⁴ Still, the longer a body has been in the water, the more decomposition obscures these markers, and in advanced cases even experienced forensic pathologists may list the cause of death as undetermined.

Why Aquatic Decomposition Looks So Different from Terrestrial

On land, the primary agents of decomposition are insects, especially blowflies and beetles, along with exposure to sun, wind, and fluctuating temperatures. A body in a warm outdoor environment on land can be skeletonized within weeks thanks largely to maggot activity. In water, that insect access is drastically reduced. Blowflies cannot lay eggs on a fully submerged body, and even a floating body only exposes a limited portion of skin above the waterline. The result is that bacterial decomposition and aquatic scavenging take over as the dominant processes, and these tend to proceed more slowly and more unevenly.

Water also creates an oxygen-poor environment around the body, especially in still or stagnant conditions. This shifts the microbial community toward anaerobic bacteria, which produce different byproducts than their oxygen-using counterparts. The sulfur compounds responsible for the greenish-black discoloration and the distinctive foul odor of aquatic remains are largely products of anaerobic metabolism. That same anaerobic environment is what enables adipocere to form, as mentioned earlier, since the bacterial conversion of fat to stable fatty acids requires oxygen-free conditions.

Current speed matters too. A body in fast-moving water may tumble along the bottom, accumulating abrasions and fractures from contact with rocks, debris, and bridge pilings. These postmortem injuries can be extensive and, combined with scavenger damage and decomposition, may make the body nearly unrecognizable. In calm, deep water, a body is more protected from physical trauma but remains subject to the same microbial and chemical processes.

Estimating Time in Water

One of the most common questions asked of forensic pathologists who examine water recoveries is how long the body was submerged. The honest answer is that these estimates are far less precise than most people assume. On land, insect development provides reasonably reliable time-of-death calculations, because fly species lay eggs on predictable schedules and larvae grow at known rates tied to temperature. Underwater, those insect clocks are absent.

Instead, investigators rely on scoring systems that rate the overall degree of decomposition, assigning points for features like bloating, skin slippage, discoloration, adipocere, and loss of tissue or body parts. These scores are then compared against data from known-interval cases to estimate a “postmortem submersion interval.” One such model developed for marine recoveries in the Adriatic showed that seasonal temperature variation did not heavily influence its predictions, which is a different pattern from freshwater models where water temperature has a larger effect on accuracy.⁵ But even the best models produce wide confidence intervals. A body with a decomposition score consistent with two weeks of submersion could realistically have been in the water for ten days or three weeks, depending on local conditions.

Other clues can help narrow the window. Algae and barnacle growth on the body follow general patterns tied to season and water conditions. Clothing degradation, the state of any personal items, and even the species of organisms colonizing the remains can provide supplementary estimates. None of these are precise on their own, and forensic experts typically combine multiple lines of evidence before offering a range.

When Bodies Are Preserved Instead of Destroyed

Under certain conditions, water can actually preserve a body rather than accelerate its destruction. Cold, deep, oxygen-poor lakes are the classic example. Bodies recovered from cold mountain lakes or deep reservoirs have occasionally been found in a state of remarkable preservation after years of submersion, with skin, hair, and clothing still intact. The cold suppresses bacterial growth, the depth eliminates insect access and UV exposure, and the low oxygen content slows chemical oxidation.

Peat bogs represent an extreme version of this phenomenon. The combination of cold, acidic, oxygen-free water and antimicrobial compounds in the peat can preserve soft tissue for thousands of years. The so-called “bog bodies” of Northern Europe, some dating back over 2,000 years, retain skin, hair, internal organs, and even stomach contents. While bogs are a niche case, they illustrate the broader principle: water’s effect on a body depends entirely on the specific chemical and biological conditions of that particular body of water.

Adipocere formation, as described above, is another preservation mechanism. A body that converts heavily to adipocere retains its shape and surface features in a way that slows or halts further decomposition. Forensic cases exist where adipocere-encased remains have been recovered from lakes and rivers decades after death and still yielded enough anatomical detail to support identification and even determine cause of death. The waxy coating essentially seals the remaining tissue away from the microbial processes that would otherwise consume it.