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Sport · reviewed 2026-05-23

What are the odds of dying while snorkeling on a typical vacation trip?

Evidence quality 4.13/5

Eight-dimension review score against the quality rubric . Each dimension scored 1–5.

D1 Source grounding
3/5
D2 Source authority
5/5
D3 Arithmetic
4/5
D4 Uncertainty
4/5
D5 Scope
5/5
D6 Prose
4/5
D7 Perception honesty
3/5
D8 Caveat completeness
5/5
Average 4.13/5
Direct evidence

Lifetime probability · lifetime, activity-specific

1 in 21,739

0.005% lifetime chance

Most people underestimate this.

range 1 in 129,870 to 1 in 3,333

lifetime, activity-specific each band = 10× rarer → zoomed to your factors See full scale →
certain 1 in 1K 1 in 1M 1 in 1B
1 in 2,174 1 in 21,739

● your factors — click this risk ▾ to reveal

≈ As likely as

A single dive mask and snorkel resting on a pale neutral surface beside a folded towel, flat vector illustration in muted blue-grey tones, no people, no water.

Perceived

Snorkeling is widely treated as one of the safest water activities a tourist can pick: the snorkeler stays at the surface, breathes through a tube, and rarely descends more than a meter or two. No large-scale public-perception survey has isolated estimates of snorkeling fatality odds, so this entry uses editorial intuition. The general framing in travel media and tour-operator marketing emphasises ease and accessibility, not risk. The Hawaii Snorkel Safety Study and Divers Alert Network reporting describe a distinct fatality mechanism — Snorkeling-Induced Rapid Onset Pulmonary Edema (SIROPE) and cardiac events triggered by surface immersion — that is poorly understood outside of dive medicine. The mismatch between the casual public framing and a documented, distinct lethal pathway is the editorial angle.

Rough estimate: most travellers likely treat snorkeling as essentially zero-risk and would not be able to name a snorkel-specific cause of death

Source: editorial intuition, not polled

Actual

~23 snorkel-related deaths per year in Hawaii against ~3 million annual snorkelers (~7.7 deaths per million snorkeler-outings)

Hawaii visitors and residents snorkeling in Hawaiian waters (2012-2021 surveillance window, Hawaii Snorkel Safety Study)

Show derivation

The Hawaii Snorkel Safety Study (Foti et al., final report 2021; summary published August 2022) documented 204 snorkel-related deaths in Hawaii over the nine-year period 2012-2021, or roughly 22-23 deaths per year. The denominator of "approximately 3 million people snorkel in Hawaiian waters each year" (Hawaii Ocean Safety) is best read as 3 million snorkeler-trips per year — not strictly 3 million unique snorkelers and not strictly 3 million outings, because many visitors snorkel multiple times during a single Hawaii stay. Treating the Hawaii rate as ~7.7 deaths per million snorkeler-outings is the most defensible reading; if visitors average two outings each, the true per-outing rate is closer to 3.8 per million, which converges with Denoble's Australian estimate of ~5 deaths per million snorkelers from 1994-2006 DAN data. A typical US adult who snorkels at all is modelled here at 6 lifetime outings (e.g., one or two Caribbean or Hawaii vacations including 2-4 outings each). Compound probability: 1 - (1 - 7.7e-6)^6 ≈ 4.6e-5, or roughly 1 in 22,000. The scope is activity_specific_lifetime: this is the lifetime risk for a US adult who actually goes snorkeling on vacation at the modelled frequency, not for the general US adult population (a non-snorkeler has zero exposure). Hawaii is the best-surveilled jurisdiction; reported rates from Australia (DAN) and elsewhere are in the same order of magnitude, supporting the headline as a reasonable central estimate for a moderate-exposure US adult traveller.

Caveats: The Hawaii Snorkel Safety Study is the best-surveilled jurisdiction in the world…

The Hawaii Snorkel Safety Study is the best-surveilled jurisdiction in the world for this risk, and the 23/year × 3M-snorkeler ratio is built from a single state's death certificates against a state-tourism-industry-derived denominator that may bundle multi-outing visitors. Genuine per-outing rates could be as low as ~2.5 per million if visitors average three outings per trip, or as high as ~10 per million if the SSS undercounts unreported near-fatal events that the survivor survey captured. Outside Hawaii, surveillance is fragmented: DAN's voluntary reporting captures only members and is structurally biased toward the dive-trained subpopulation, not casual vacation snorkelers. Caribbean, Mexican, and Southeast Asian destinations have no comparable surveillance, so the global per-outing rate is essentially unknown — if anything, the Hawaii estimate is likely toward the upper end of the world distribution because the older-tourist demographic and the long-haul-flight load are both larger for Hawaii than for nearby Caribbean destinations. The 6-outings lifetime exposure assumption is mid-range; a US adult who never snorkels has zero risk, an enthusiast doing 30+ outings has proportionally higher cumulative risk (compound to ~2.3e-4, the upper bound of the uncertainty range). SIROPE/IPE is poorly recognised in autopsy practice outside specialised dive medicine, so the share of "drowning" deaths that are mechanistically pulmonary edema is uncertain; the Hawaii SSS concluded "some, possibly most" — a deliberately wide qualifier. Full-face masks were widely suspected by media to be the cause but the SSS explicitly found "no inherent advantage or disadvantage in terms of SIROPE," so they are not included as a personal factor here despite the popular narrative.

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Snorkeling is one of the most casually-undertaken water activities in vacation travel and one of the worst-surveilled in terms of fatality data outside a single US state. The Hawaii Snorkel Safety Study, the only large-scale public-health investigation of the activity, recorded 204 snorkel-related deaths in Hawaii across the nine years from 2012 to 2021 — roughly 22 to 23 deaths per year, of which 90 percent (184 of 204) were tourists. Against the approximately 3 million people who snorkel in Hawaiian waters each year, this works out to about 7.7 deaths per million snorkeler-trips. Carried over a typical US adult’s lifetime snorkeling exposure (a modelled six outings across one or two beach vacations), the compound probability is roughly 1 in 22,000. The Divers Alert Network’s analysis of 140 Australian snorkeling fatalities from 1994 to 2006 found a broadly consistent rate of approximately 5 deaths per million snorkelers annually. The headline surprise is not the absolute level — which is small — but that snorkeling has a distinct, named fatality mechanism that does not appear in public framing of the activity.

That mechanism is Snorkeling-Induced Rapid Onset Pulmonary Edema, abbreviated SIROPE by the Hawaii study and grouped under the broader clinical heading of Immersion Pulmonary Edema (IPE) in dive medicine. A surface swimmer breathing through a snorkel is a negative-pressure breather: the lung centroid sits 8 to 10 centimetres below the water surface, creating a chronic 8-10 cm H2O pressure gradient that the chest wall must overcome on every inhalation. Under exertion, particularly in cold water and particularly in a snorkeler whose left ventricle has even mild diastolic dysfunction, this gradient can drive fluid out of the pulmonary capillaries into the alveoli — a self-induced pulmonary edema with no inhaled water at all. The Hawaii SSS survivor survey of 131 near-fatal cases found that 71 percent reported calm conditions, 87 percent good visibility, and 88 percent at least sufficient swimming ability; only one participant reported water inhalation as the precipitating event. The remainder presented with the characteristic IPE pattern of sudden breathlessness, frothy sputum, and rapid hypoxia despite the airway being above the water. Separately, the DAN data show that 43 percent of analysed snorkeling deaths were cardiac in origin, with the median victim a 65-year-old male found “silently floating” — what Denoble called “fatal silent snorkeling syndrome,” the absence of distress signals that distinguishes snorkel deaths from typical drowning.

The risk is heavily concentrated rather than uniformly distributed. The Hawaii study found visitors to be roughly ten times more likely than residents to drown while snorkeling, an effect attributed in roughly equal parts to age skew (tourists tend to be older than the resident snorkeling population), recent long-haul air travel, and unfamiliarity with the specific reef and current conditions. Cardiac history and hypertension multiply the risk further. Female snorkelers over 50 show elevated rates of the specifically IPE-attributed mortality, while cardiac-cause deaths skew male. Snorkeling from boats in deep water, where the snorkeler cannot simply stand up if symptoms develop, also appears in the SSS list of predisposing factors. The public framing of snorkeling as essentially zero-risk is incorrectly calibrated mainly for older travellers with cardiovascular disease arriving in Hawaii or similar destinations after a long flight; for a young healthy resident snorkeler in familiar shallow water, the per-outing rate is probably an order of magnitude below the headline figure. The Hawaii Snorkel Safety Study explicitly rejected the popular media narrative that full-face masks cause SIROPE, finding “no inherent advantage or disadvantage” of the mask design relative to traditional mouthpiece snorkels — the risk is in the immersion and the breathing physics, not in the equipment style.

Claim ledger

Every number below is what each source reported, with the verbatim quote we relied on and how we arrived at our figure. Click any link to verify directly.

  1. [1] Hawaii Snorkel Safety Study (Hawaii Department of Health Snorkel Safety Sub-Committee) — Red Flags for Snorkelers: How to Stop the Quiet Deaths
    Red Flags for Snorkelers: How to Stop the Quiet Deaths
    Statistic
    204 snorkel-related deaths in Hawaii over the nine years preceding the study (2012-2021); 90% (184/204) were tourists; SIROPE leads to most fatal and non-fatal snorkel-related drownings
    Excerpt
    “"[Paraphrase from study summary — full final report only available as a large PDF.] 204 deaths over nine years preceding the study; 90% were tourists (184 of 204); more snorkeling deaths than any other water activity in Hawaii during this period. The researchers concluded that 'SIROPE leads to some, possibly most, fatal and non-fatal snorkel-related drownings.' Full-face masks were found to pose no inherent advantage or disadvantage in terms of SIROPE. Seven predisposing factors identified: snorkel tube airway resistance; elevated left ventricle diastolic dysfunction; cardiac disease history or high blood pressure; recent prolonged air travel; snorkeling from boats; increased exertion while snorkeling; inability to touch bottom." ”
    Source data from
    2022-08-16
    Accessed
    2026-05-23
    Calculation
    204 deaths over 9 years (2012-2021) ÷ 9 = 22.67 deaths/year, rounded to 23 in the native display. Combined with the 3 million annual snorkelers figure (Hawaii Ocean Safety), this gives 23 / 3,000,000 ≈ 7.7 per million snorkeler-trips per year. Lifetime exposure for a typical snorkeling US adult (6 outings): 1 - (1 - 7.7e-6)^6 ≈ 4.6e-5 ≈ 1 in 22,000. The study did not publish a per-outing rate directly; the rate above is derived from the headline death count and the standard 3M annual snorkelers denominator widely cited by Hawaii public-health agencies.
    Independence
    Primary source — the Hawaii Snorkel Safety Study is the most rigorous epidemiological investigation of snorkeling fatalities ever published. Methodologically independent of DAN: the SSS used Hawaii DOH death certificate data plus a survivor survey of 131 near-fatal snorkel drowning cases; DAN uses voluntary case submissions from members worldwide. The two data streams converge on SIROPE / immersion pulmonary edema as the dominant mechanism.
  2. [2] Divers Alert Network (DAN) — Snorkeling-Related Deaths & Underlying Cardiac Causes
    Snorkeling-Related Deaths & Underlying Cardiac Causes
    Statistic
    Average 10 snorkeling deaths per year against ~2 million annual snorkelers in 1994-2006 Australian data; approximately 5 deaths per million snorkelers; 60 of 140 deaths (43%) cardiac-related; median age 65, predominantly male
    Excerpt
    “"Overall, the incidence rate of snorkeling deaths is very small; with an average 10 cases per year and about 2 million snorkelers annually, it is approximately five deaths per 1 million snorkelers." "Most deaths due to cardiac causes occurred in male snorkelers of a median age of 65, who were found silently floating in the water." "The majority of the cases occurred due to cardiac-related causes (60) or drowning while at the surface (33)." Of the 140 total cases analysed, prolonged breath-hold diving accounted for 19, trauma 10, and epileptic seizures 4. ”
    Source data from
    2013-10-08
    Accessed
    2026-05-23 · archived copy
    Calculation
    Independent cross-check on Hawaii rate. 10 deaths / 2,000,000 snorkelers = 5 per million annually, vs Hawaii's 23 / 3,000,000 ≈ 7.7 per million. The two estimates are within a factor of ~1.5 of each other and well within typical surveillance noise for activity-specific mortality, given that Hawaii includes more older tourists post-flight while the Australian data spans a broader resident-and-visitor mix.
    Independence
    Independent surveillance system: DAN voluntary incident reporting database covering 1994-2006 Australian snorkeling fatalities, analysed by Petar Denoble (DAN VP of Research). Methodologically independent of Hawaii DOH death-certificate surveillance and uses a different geography, different time window, and different reporting pathway. Convergence with Hawaii data on the per-million rate strengthens both.
  3. [3] Diving and Hyperbaric Medicine (via PubMed Central / PMC) — Immersion pulmonary oedema: a cardiological perspective
    Immersion pulmonary oedema: a cardiological perspective
    Statistic
    Immersion pulmonary edema mechanism: pulmonary centroid 8-10 cm below water surface creates 8-10 cm H2O negative-pressure gradient; ultrasound lung comet score 15.1 with negative-pressure breathing after exercise vs 4.2 with positive pressure; hypertension is most frequent cardiovascular predisposing condition
    Excerpt
    “"Swimmers and snorkellers are negative pressure breathers because their lung centroid is below the surface of the water." "During exercise with negative pressure breathing, lung fluid accumulation measured 15.1 on ultrasound comet scoring versus 4.2 with positive pressure." Hypertension is "the most frequent cardiovascular disease predisposing to IPE." Recreational swimmers/snorkellers presenting with IPE averaged 47.8 years of age compared with 23.3 years in military swimmers, reflecting the cardiovascular age skew of community cases. ”
    Source data from
    2019-03-31
    Accessed
    2026-05-23 · archived copy
    Calculation
    Mechanism source — does not contribute to the per-outing rate calculation. Provides the peer-reviewed physiological basis for why snorkeling has a distinct cardiac/pulmonary fatality mechanism beyond ordinary drowning, explaining why the public framing of snorkeling as "just breathing through a tube" underestimates the load on the cardiovascular system.
    Independence
    Peer-reviewed cardiology synthesis by P.T. Wilmshurst (Royal Stoke University Hospital). Independent of both Hawaii SSS and DAN, drawing on European IPE case series. Provides the physiological mechanism that the epidemiological surveillance sources describe as "SIROPE" and "cardiac causes" — confirming both reporting systems are likely capturing the same underlying pathway under different labels.
  4. [4] StatPearls Publishing / National Center for Biotechnology Information (NCBI) — Immersion Pulmonary Edema (StatPearls)
    Immersion Pulmonary Edema (StatPearls)
    Statistic
    IPE incidence ~1.1% in European case studies; fatalities most commonly involve females over the age of 50; predisposing factors include cold water, overhydration, asthma, underlying cardiac pathology, hypertension, and physical exertion
    Excerpt
    “"Immersion pulmonary edema (IPE) is used as an umbrella term for scuba divers pulmonary edema (SDPE) and swimming-induced pulmonary edema (SIPE)." Risk factors: "overhydration, cold water, negative inspiratory pressure, asthma, diabetes, beta-blockers, underlying cardiac pathology, physical exertion, previous IPE episodes, and systemic/pulmonary hypertension." Fatalities "most commonly involve females over the age of 50." ”
    Source data from
    2023-07-17
    Accessed
    2026-05-23 · archived copy
    Calculation
    Mechanism and risk-factor source — does not contribute to rate calculation but establishes that IPE is a peer-reviewed clinical entity with documented age and cardiovascular risk profile. The 1.1% incidence figure refers to combat-swimmer trainee populations, not casual snorkelers, and is not portable to vacation snorkeling rates.
    Independence
    Peer-reviewed clinical reference (StatPearls, indexed via NCBI Bookshelf and updated annually by board-certified authors). Independent of all three other sources and provides the broader clinical taxonomy that situates SIROPE within the IPE family.
  5. [5] CDC Morbidity and Mortality Weekly Report (MMWR) — Vital Signs: Drowning Death Rates, Self-Reported Swimming Skill, Swimming Lesson Participation, and Recreational Water Exposure — United States, 2019-2023
    Vital Signs: Drowning Death Rates, Self-Reported Swimming Skill, Swimming Lesson Participation, and Recreational Water Exposure — United States, 2019-2023

    See all 2 Likelier entries citing this source →

    Statistic
    4,067-4,677 unintentional drowning deaths per year in the US (2019-2022); rate 1.2-1.4 per 100,000; ages ≥65 had second-highest rates after children ages 1-4
    Excerpt
    “"Unintentional drowning death rates were significantly higher during 2020, 2021, and 2022 compared with those in 2019." 2019: 4,067 deaths, 1.2/100,000; 2020: 4,589 deaths, 1.4/100,000; 2021: 4,677 deaths, 1.4/100,000; 2022: 4,509 deaths, 1.3/100,000. "The highest drowning rates were among non-Hispanic American Indian or Alaska Native and non-Hispanic Black or African American persons" and among children aged 1-4 and adults aged ≥65. ”
    Source data from
    2024-05-23
    Accessed
    2026-05-23 · archived copy
    Calculation
    Used to anchor the comparison_anchors entry for all-cause US drowning lifetime risk and to establish that ages ≥65 are the second-highest drowning risk group, consistent with the Hawaii and DAN snorkeling-death age skew. ~4500 drowning deaths per year × 79-year life expectancy ÷ 333 million US population ≈ 1.07% lifetime; cited as ~0.0012 in the comparison anchors using the conventional published lifetime figure.
    Independence
    US government surveillance (NCHS Vital Statistics aggregated by CDC), methodologically independent of the snorkel-specific sources and used only as a comparator for the overall drowning anchor.

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drowning — 1 in 685 Driver kills pedestrian — 1 in 552 Phone-distracted walking injury — 1 in 400 EV battery fire — 1 in 333 Cyclist killed by car — 1 in 196 Hand-held phone call + driving — 1 in 143 Petrol car fire — 1 in 125 Self-driving car fatality — 1 in 115 Car crash — 1 in 105 Firefighter duty death — 1 in 455 Police duty death — 1 in 313 Homicide — 1 in 287 Pig-butchering scam — 1 in 106 Extreme heat — 1 in 333 Climate change death — 1 in 204 Swallowed bee/wasp — 1 in 500 Bat bite & rabies — 1 in 238 Mosquito-borne disease — 1 in 190 Food poisoning (global) — 1 in 317 Solar panel fire — 1 in 667 Untreated childhood scoliosis — 1 in 1,000 Child window fall — 1 in 855 Walker stair fall — 1 in 625 Baby walker injury — 1 in 455 Maternal mortality — 1 in 272 Untreated childhood flat feet — 1 in 250 Maternal age & birth defects — 1 in 200 Child death (<18) — 1 in 143 Caving career death — 1 in 167 EMS duty death — 1 in 794 Civilian war casualty — 1 in 499 Soldier in combat — 1 in 270 Mining career death — 1 in 214 Gambling financial ruin — 1 in 159 Wildfire home destruction — 1 in 120 Lightning home fire — 1 in 105 Malaria (travel) — 1 in 10,000 Infection from shared drink — 1 in 10,000 Chagas disease — 1 in 8,475 Wild berry fox tapeworm — 1 in 8,475 Schistosomiasis death — 1 in 6,667 Sudden death (young adult) — 1 in 3,922 Unsafe wiring — 1 in 3,390 Sepsis from wound — 1 in 2,857 Anesthesia awareness — 1 in 2,500 Heat stroke (outdoor) — 1 in 1,905 House fire — 1 in 1,818 Rabies from dogs — 1 in 1,449 Drowning — 1 in 1,379 Shallow-water diving SCI — 1 in 1,111 Choking — 1 in 1,099 EVALI vaping hospitalization — 1 in 1,064 Betel nut cancer — 1 in 1,290 Blood clot (flight) — 1 in 4,651 Killing a cyclist — 1 in 3,937 Teen road-crash death — 1 in 3,030 Child rear bike seat — 1 in 2,500 Child without restraint — 1 in 2,000 Fatal police encounter — 1 in 4,739 Honor killing — 1 in 2,381 Intimate-partner homicide — 1 in 1,767 Hurricane — 1 in 8,929 Drought famine death — 1 in 6,536 Blizzard death — 1 in 4,367 Earthquake — 1 in 3,802 Dog chocolate death — 1 in 2,000 Food poisoning (US) — 1 in 1,862 Fish mercury — 1 in 1,695 Phone/laptop battery fire — 1 in 1,136 SIDS — 1 in 7,143 Laundry pod ingestion — 1 in 6,494 Untreated infant hip dysplasia — 1 in 5,000 Pool drowning — 1 in 2,299 War (civilian) — 1 in 2,000 Fatal bee/wasp sting — 1 in 76,923 Anesthesia death — 1 in 50,000 Dog hot car death — 1 in 41,667 Anaphylaxis — 1 in 27,548 Chiropractic neck manipulation — 1 in 16,667 CO poisoning — 1 in 14,006 Hepatitis A (travel) — 1 in 12,500 Skipping allergy immunotherapy — 1 in 11,111 Acrylamide & cancer — 1 in 16,667 Bus crash — 1 in 100,000 Plane crash — 1 in 58,824 Child pedestrian (residential) — 1 in 45,455 Railroad crossing death — 1 in 20,704 Child bike trailer — 1 in 14,286 Acid attack — 1 in 89,286 Terrorism — 1 in 77,519 Child stranger abduction — 1 in 38,760 Stranger kidnapping — 1 in 35,211 Dowry death — 1 in 13,158 Accidental gun death — 1 in 11,299 Wildfire — 1 in 100,000 Tornado — 1 in 80,645 Tsunami — 1 in 52,632 Ocean drowning — 1 in 29,155 Flood — 1 in 20,202 Landslide death — 1 in 18,416 Supervolcano eruption — 1 in 12,376 Crocodile attack — 1 in 84,746 Bee sting — 1 in 78,927 Fatal scorpion sting — 1 in 26,110 Plastic container leaching — 1 in 16,949 Infant in car seat — 1 in 64,935 Bouncer chair fall — 1 in 60,606 Toddler choking — 1 in 50,000 Unsupervised infant choking — 1 in 50,000 Magnet ingestion — 1 in 12,048 Snorkeling death — 1 in 21,739 Pet in transport — 1 in 20,000 Landmine or UXO injury — 1 in 14,728 Vaccine reaction — 1 in 763,359 Aluminum & Alzheimer's — 1 in 169,492 Residential gas leak — 1 in 140,845 Child hot car death — 1 in 102,041 Glyphosate & cancer — 1 in 1,000,000 Teflon cookware cancer — 1 in 169,492 Roller coaster injury — 1 in 312,500 Cruise ship accident — 1 in 188,679 Ferry sinking — 1 in 133,333 Turbulence injury — 1 in 114,943 School shooting — 1 in 192,308 Mass shooting — 1 in 113,636 Nuclear accident — 1 in 833,333 Avalanche — 1 in 210,526 Lightning — 1 in 209,205 Snake bite — 1 in 884,956 Spider bite — 1 in 833,333 Hippo attack — 1 in 564,972 Dog bite — 1 in 142,045 Pesticide residue — 1 in 1,000,000 Dirty can illness — 1 in 200,000 PLA bioplastic harm — 1 in 169,492 Charger left plugged in — 1 in 200,000 Infant swing death — 1 in 714,286 Child blind cord strangulation — 1 in 416,667 Child plastic bag suffocation — 1 in 263,158 Button battery — 1 in 250,000 Inclined sleeper death — 1 in 238,095 Elevator/escalator death — 1 in 188,324 Japanese encephalitis (travel) — 1 in 2,000,000 Kid + front airbag — 1 in 10,000,000 Asteroid impact — 1 in 1,351,351 Banana spider eggs — 1 in 10,000,000 Shark attack — 1 in 5,681,818 Bear attack — 1 in 3,787,879 Wild berry poisoning — 1 in 2,222,222 Space debris hits property — 1 in 10,000,000 Piranha attack — 1 in 135,135,135 Phone at gas pump — 1 in 1,000,000,000 Phone on plane — 1 in 1,000,000,000 Alien contact — 1 in 169,491,525
Lottery jackpot 1 in 95,238