ʻO ka hoʻoheheʻe ʻana i ka wai wai a me ka hāliʻi uila¶

Swimming pools, hot tubs, fountains, and freshwater boat marinas harbor two invisible, non-traditional drowning hazards that kill even strong adult swimmers in seconds: submerged drain suction entrapment and Electric Shock Drowning (ESD). When a swimming pool or spa circulation pump pulls water through a broken, missing, or flat single-outlet main drain cover at the bottom of the pool, it generates a localized vacuum force of 130 to over 350 kilograms (300 to 800 pounds). If a child or adult sits on or swims close to an uncovered suction fitting, the pump seals their body tightly against the pipe opening or tangles long hair into the grate slots. No human being, regardless of strength, can pull a body straight up against 300 kilograms of hydraulic vacuum suction; instead, rescuers must immediately break the vacuum seal by sliding fingers underneath the victim's body edge while shutting off the circulation pump breaker.

Even deadlier for would-be rescuers is Electric Shock Drowning (ESD) around freshwater boat docks, marinas, and swimming pools with faulty underwater lighting or pump grounding. When alternating current (AC) electricity leaks into fresh water from a boat shore-power cord, dock wiring, or a cracked pool light housing, it sets up an invisible voltage gradient field through the water. Because fresh water has much higher electrical resistance than the human body (unlike conductive saltwater, which mostly shorts current around a swimmer), AC current flows straight through the swimmer's chest and limbs. Just 10 to 15 milliamperes (0.015 amps) of AC current paralyzes all voluntary skeletal muscles (tetanic contraction / "let-go" threshold), freezing the swimmer in place so they sink and drown silently, while electrocuting anyone who jumps into the water to save them. Knowing how to break drain suction instantly, how to swim out of a tingling electrical field toward a non-conductive fiberglass hull or dry steps without touching metal pool ladders, and how to cut dock power before attempting a rescue saves multiple lives.

E hana i kēia i kēia manawa¶

1. Slide your fingers between the drain opening and the victim's skin to break the vacuum seal if someone is stuck to a pool drain. Never try to pull the victim straight up away from the drain, which is physically impossible against 300 kilograms (660 pounds) of suction and causes fatal disembowelment; pry your fingers or a flat plastic tool under the edge of their hip or abdomen to let water rush in and break the vacuum while someone shuts off the pool pump breaker.
2. Cut entangled hair with scissors or tear off hooked jewelry/swimsuits immediately if snagged on a drain grate. If long hair is knotted inside a drain cover's slots by flowing water, do not waste seconds trying to untangle wet hair underwater; shut off the pump and slice the hair off close to the grate with shears or a knife, or hold the victim's nose and mouth at the surface if the drain is in a shallow spa.
3. NEVER jump into the water if a swimmer is screaming of "tingling," frozen stiff, or floating motionless near a boat dock or pool light. Jumping into water energized by an AC electrical leak instantly paralyzes you alongside the victim; stay on dry land, throw a floating ring buoy or fiberglass pole, and shut off the main marina dock pedestal breaker or house pool subpanel immediately.
4. Swim AWAY from metal ladders, boat sterns, and pool lights if you feel an electrical tingle or cramp while swimming. Never grab a metal pool ladder or metal dock frame to climb out of tingling water, as the metal ladder is grounded and acts as a lightning rod that channels lethal current straight through your heart; swim toward a fiberglass boat hull, wooden/concrete steps, or shallow beach shoreline.
5. Begin rescue breathing AND chest compressions (full 30:2 CPR) immediately as soon as a drowning or ESD victim is pulled onto dry land. Unlike sudden cardiac arrest on dry land (where hands-only CPR is used), drowning victims are dying of severe oxygen starvation (hypoxia); give 2 rescue breaths first (or 5 initial rescue breaths per European/UK guidelines) followed by 30 chest compressions and 2 breaths, and apply an AED after wiping the chest dry.
6. Take EVERY rescued drain-entrapment or near-drowning survivor to a hospital emergency room, even if they cough up water and seem fine. Pool drain suction on the buttocks or abdomen causes catastrophic internal bowel rupture (transanal evisceration), while inhaled pool water washes away lung surfactant and can trigger life-threatening delayed respiratory failure (pulmonary edema) 4 to 12 hours later; call your local emergency number (911 in the United States and Canada, 112 across the European Union, 999 in the United Kingdom) or check helu pilikia.

flowchart TD
    Start["Pool, Spa, or Marina Water Emergency"] --> Hazard{"What is trapping or incapacitating the swimmer?"}
    Hazard -->|"Stuck Underwater on Pool / Spa Drain"| DrainType{"Is it body vacuum suction or hair/limb entanglement?"}
    Hazard -->|"Tingling Water / Paralyzed Swimmer Near Dock or Pool Light"| ESDStop["ELECTRIC SHOCK DROWNING (ESD):<br/>1. DO NOT JUMP IN WATER<br/>2. Shut off main dock breaker or pool electrical panel immediately<br/>3. Throw rope / ring buoy or reach with fiberglass pole AFTER power is off"]
    DrainType -->|"Body Vacuum Seal (Abdomen, Back, Buttocks)"| BreakSeal["1. DO NOT pull straight up<br/>2. Slide fingers under edge of victim's body against drain to break vacuum seal<br/>3. Shut off pool pump breaker immediately"]
    DrainType -->|"Hair or Swimsuit Entangled in Grate"| CutHair["1. Shut off pool pump immediately<br/>2. Cut hair or fabric with scissors/knife close to grate<br/>3. Hold victim's head above water if shallow spa"]
    BreakSeal --> DryCPR["Pull onto dry deck, check breathing, start full CPR WITH RESCUE BREATHS (2 breaths : 30 compressions) + AED"]
    CutHair --> DryCPR
    ESDStop --> DryCPR

Five types of swimming pool and spa suction entrapment¶

According to the United States Consumer Product Safety Commission (CPSC, which enforces the Virginia Graeme Baker Pool and Spa Safety Act) and the Royal Life Saving Society, submerged circulation drains trap swimmers through five distinct mechanical pathways. Recognizing which mechanism is occurring tells you the exact tool and technique needed to free the victim within the 60-to-120-second underwater survival window.

ʻO ka physics o ke kumu ʻaʻole hiki iā ʻoe ke huki i kahi mea i hōʻeha ʻia mai kahi wai wai¶

No ke aha e hiki ʻole ai i ʻelua mau mākua ikaika ke huki i kahi keiki he 25 kilokalama (55 paona) mai lalo mai o ka wai ʻauʻau 1 mika ka hohonu?

• Hoʻokumu ka pāpaʻa ʻauʻau ʻauʻau hale noho a pāʻoihana paha i kahi poʻo maloʻo ma kahi o 15 a 25 ʻīniha o ka mercury (50 a 85 kilopascals, a i ʻole 7.5 a 12.5 paona i kēlā me kēia ʻīniha square / psi) ke pāpā ʻia kona laina komo.
• Inā hoʻopaʻa ʻia ke kua a i ʻole ka ʻōpū o ke keiki ma luna o kahi puka wai wai maʻamau 20-by-20-kenimika (8-by-8-ʻīniha = 64 ʻīniha huinaha): $\(\kikokikona {Hoʻopaʻa i ka Mana} = 64\text{ i}^2 \times 10\text{ psi} = \mathbf{640\text{ paona (290 kilokani)}}\)$
• ʻO ka huki ʻana i luna e kūʻē i 290 kilokani (640 paona) o ka momi ʻoiai e kū ana i loko o ka wai paheʻe he mea hiki ʻole ke kino. ʻO ka ʻoi aku ka ʻino, inā e noho ana ke keiki ma ka ʻauwai me ko lākou ʻāʻī e hoʻopaʻa ana i ka pū, ʻo ka huki pololei ʻana i ke keiki i luna ma nā lima e hoʻonui ai i ke kaomi maikaʻi ʻole i loko o ka lua a ʻoki ʻia ka ʻōpū o ka ʻōpū haʻahaʻa o ke keiki mai ko lākou kino.
• No ke aha e hana ai ka haki ʻana i ke sila ʻaoʻao i loko o 2 kekona: Pono ka ʻūhā hydraulic i kahi 100 pākēneka paʻa o ka ea/wai paʻa wai i hoʻokumu ʻia e ka ʻili palupalu o ka mea i pepehi ʻia e kūʻē i ke apo plastik palahalaha. Ke ʻoki ʻoe i nā manamana lima ʻelua, kahi ʻauʻau pulupulu ʻauʻau plastik, a i ʻole ka pahi pata he 5 millimeters wale nō ma lalo o ke kaʻe o ka ʻūhā a i ʻole ka iwi ʻaoʻao o ka mea i pepehi ʻia, e holo koke ana ka wai loko i loko o ka paipu haʻahaʻa haʻahaʻa, e hoʻohālikelike ana i ke kaomi i ka zero a hoʻokuʻu koke i ka mea i pepehi ʻia.

Pehea e pani ai i ka puna wai i ka pilikia¶

Pono ka mea nona ka hale, ka malihini hōkele, a me ka mea ʻauʻau hale noho i ka Emergency Pump Shutoff Switch ma mua o ke komo ʻana i loko o ka loko wai a i ʻole ka ʻauʻau wela:

1. Ma nā hōkele kalepa, loko o ka lehulehu, a me nā ʻauʻau ʻauʻau: E nānā i ka paia i loko o 1.5 a 5 mau mika (5 a 15 kapuaʻi) o ka spa a i ʻole ka ʻaoʻao wai no ka pihi pihi Red Mushroom "EMERGENCY PUMP SHUTOFF" nui a i ʻole kahi kīʻaha manawa puna he 15 mau minuke, a paʻi iā ia i OFF.
2. Ma nā loko o ka pā hale noho: Holo i ka papa lako wai (e kū mau ma ka ʻaoʻao o ka hale a i ʻole ma hope o ka pā kahi e noho ai ka pahu kānana a me ke kaʻa pamu) a hoʻohuli i ka holo kaapuni kaapuni i loko o ka pahu subpanel i OFF, a i ʻole e wehe i ka papa hoʻomaha uila hale nui a hoʻohuli i ka pahu pālua 20-amp a i ʻole 30-amp Pump / Spa.
3. Inā ʻaʻole hiki iā ʻoe ke loaʻa ke kī uila i loko o 10 kekona: Holo i ka mīkini pahū ma ka pā lako a ** wehe i ka poʻi ipu ipu kānana paʻa paʻa maʻemaʻe** (a i ʻole e hoʻohuli i ka pahu kānana kānana multi-port i Pani/Winterize) e hoʻokuʻu i ka ea o waho i loko o ka laina hoʻoheheʻe a wāwahi i ka ʻōpala, a i ʻole e uhaʻi i ka paipu plastik PVC ma luna o ka lepo ma ka pahu wai kaumaha.

ʻO ka Drowning Shock Drowning (ESD) a puni nā uka, nā marinas, a me nā loko¶

ʻO Electric Shock Drowning (ESD) ka mea pepehi hāmau i nā loko wai maʻemaʻe, nā muliwai, nā moku moku, a me nā loko ʻauʻau ma hope. ʻAʻole like me ka uila uila, hoʻokumu ʻia ka ESD e ka hale haʻahaʻa 120-volt a i ʻole 240-volt Alternating Current (AC) uila e kahe ana i ka wai mai nā uwea hewa.

Pehea ka uila AC haʻahaʻa haʻahaʻa e hoʻopololei ai (ka paepae 10 mA)¶

He 50-hertz a i ʻole 60-hertz mau ʻauwaʻa e make ai ke kanaka i loko o ka wai:

• 1 a 5 milliamperes (0.001 a i 0.005 amps): Ke ʻike nei ka mea ʻauʻau i ke kani ʻana a i ʻole ka "fizzy" ma ko lākou mau wāwae a lima paha.
• 10 a 15 milliamperes (0.010 a 0.015 amps) -> ʻO ka "Let-Go" / Paralysis Threshold: Ma lalo o hoʻokahi-haneri o kēia manawa i hoʻohana ʻia e ka mea maloʻo lauoho e hoʻoulu ai i ka **tetanic contraction ** i nā ʻiʻo iwi āpau i loko o nā lima, nā wāwae, a me nā wāwae. ʻAʻole hiki i ka mea ʻauʻau ke wehe i ko lākou mau lima, ʻaʻole hiki ke kīkī i nā wāwae, a ʻaʻole hiki ke hoʻōho no ke kōkua no ka mea ua paʻa ko lākou mau kaula leo a me ka diaphragm i ka spasm. I loko o nā kekona, hāʻule ka mea ʻauʻau lolo ma lalo o ka ʻili a make.
• 50 a 100 milliamperes (0.05 a 0.1 amps): ʻO ka hele ʻana i kēia manawa ma ka umauma e hoʻoulu koke i ka ventricular fibrillation (hopu puʻuwai).
• No ke aha i kuhi hewa pinepine ʻia ai ʻo ESD ma ke ʻano he lumo maʻamau: No ka holoi ʻana o ka wai ma luna o ka ʻili holoʻokoʻa, haʻalele ka ESD uila i ** ʻaʻohe hōʻailona kuni uila ma ka ʻili**, a hōʻike ʻia ka autopsy i ka wai i loko o ka māmā e like me ka make maʻamau. Aia wale nō i ka lele ʻana o ka lua a i ʻole ke kolu o ka mea hoʻopakele a manaʻo i ka haʻalulu uila ke kumu maoli i ʻike ʻia.

1. What to do if YOU feel a tingle or shock while swimming in a pool or lake¶

Inā ʻoe e ʻauʻau ana a ʻike koke ʻoe i ke kaniʻuhū, ka haʻalulu, a i ʻole ka ʻūhā ʻana ma kou mau wāwae, wāwae, a lima paha:

1. Shout "ELECTRICITY IN THE WATER, DO NOT JUMP IN, CUT THE POWER" immediately while you can still speak.
2. Tuck your legs up (fetal or breaststroke tuck) to shorten your body span: In an underwater voltage gradient, the amount of current flowing through your body is proportional to the distance between your head/hands and your feet ("step/body potential"). Spanning 1.8 meters (6 feet) horizontally or vertically across voltage lines captures a much higher voltage difference than curling into a compact posture.
3. Turn 180 degrees and swim back the exact way you came: If the tingling started getting stronger as you swam toward a boat stern, dock piling, or underwater pool light, immediately reverse direction toward the center of the pool or open lake water where the voltage gradient weakens.
4. NEVER touch a metal pool ladder, metal dock ladder, metal boat hull, or metal handrail to get out of the water:
5. This is the most fatal mistake in ESD survival. The metal pool ladder or metal dock frame is connected to earth ground (or is the source of the fault). When your wet body is in energized water and you reach up and grab a metal ladder rail, your arms and chest become the direct wire bridge connecting the water to ground, sending a fatal surge of current straight through your heart and locking your fingers onto the metal rung so you cannot let go.
6. Instead, exit the water only via molded concrete/fiberglass pool steps (without touching the metal handrail), by belly-flopping straight onto the dry concrete pool deck edge, by swimming to a sandy beach shoreline, or by climbing onto a non-conductive inflatable raft or fiberglass/wooden boat that is unplugged from shore power.

2. How bystanders on dry land must rescue an ESD victim¶

1. Stay out of the water and keep all other bystanders and dogs out.
2. Cut the electrical power immediately:
3. At a marina or boat dock: Run to the shore-power electrical pedestal on the dock next to the boats and flip the circuit breakers to OFF, then yank the heavy yellow or black shore-power cord plug out of the dock pedestal receptacle (only while standing on dry wood/concrete wearing dry shoes; never touch wet metal). Better yet, throw the Main Marina Dock Disconnect Breaker at the head of the pier where the walkway meets the land.
4. At a swimming pool or hot tub: Run to the pool subpanel or main house breaker box and flip the Main Breaker off, or unplug any extension cords running to the pool area.
5. Reach or throw with non-conductive gear:
6. Once power is off (or while a second person is running to the breaker), throw a USCG-approved ring buoy attached to a polypropylene rope, or reach out using a fiberglass shepherd's crook pool pole (never an aluminum pool pole) to hook the victim's waist and pull them to the steps.
7. Never touch the wet victim with your bare hands while their lower body is still hanging in the water if you are not 100 percent certain the power has been disconnected; loop a dry rope or dry towel under their arms to drag them completely onto dry land first.

Resuscitating a drowning or ESD victim on dry land¶

Once the victim is out of the water and on a dry, non-conductive surface, every second is a race to restore oxygen to their brain and heart.

1. Check responsiveness and breathing for no more than 10 seconds: Tap the collarbone and shout, while looking at the chest for normal breathing (do not mistake occasional slow, reflexive gasping or "agonal breaths" for real breathing).
2. Deliver 2 rescue breaths FIRST (5 rescue breaths in UK/European protocols) if not breathing:
3. Unlike a sudden heart attack on a golf course where the blood is still full of oxygen, a drowning victim's heart has stopped because every drop of oxygen in their blood has been used up. Pumping oxygen-empty blood with chest compressions alone is much less effective until you put fresh air into the lungs.
4. Tilt the head back, lift the chin, pinch the nose shut, make a tight seal over their mouth, and blow steadily for 1 second just enough to make the chest visibly rise.
5. Do NOT try to press on the stomach (Heimlich maneuver) or turn the victim upside down to "drain water from the lungs." Pressing on a drowning victim's stomach forces acidic stomach contents up into the throat and lungs, blocking the airway and causing fatal aspiration pneumonia. Small amounts of water in the lungs absorb rapidly into the bloodstream once you blow air in.
6. Perform full 30:2 CPR (30 chest compressions to 2 rescue breaths):
7. Push hard and fast in the center of the chest (5 to 6 centimeters / 2 to 2.4 inches deep for an adult, at a rate of 100 to 120 compressions per minute), alternating 30 compressions with 2 rescue breaths; see CPR instructions a drowning first aid.
8. If the victim vomits water or food during CPR (which happens in over 60 percent of drowning resuscitations), immediately roll them onto their side as a single unit, sweep their mouth clear with your finger wrapped in a cloth, roll them back onto their back, and resume CPR immediately.
9. Apply an Automated External Defibrillator (AED) as soon as it arrives:
10. Electric Shock Drowning victims are frequently in ventricular fibrillation, which requires an immediate electrical shock from an AED to restart a normal rhythm.
11. Pull the victim at least 2 meters (6.5 feet) away from puddles (it is safe to use an AED on damp ground or poolside concrete as long as the victim is not lying in a deep puddle connecting to the rescuer), briskly wipe the victim's bare chest completely dry with a towel so the pads do not short-circuit across wet skin, stick the AED pads on, and follow the voice prompts; see electric shock first aid.

Nīnau pinepine¶

Nā alakaʻi pili¶

• ʻO ka luʻu: hoʻopakele wai a hoʻōla hou
• ʻO ka haʻalulu uila: kōkua mua a me ka palekana
• CPR: hoʻopiʻi umauma, hanu hoʻopakele, a me ka hoʻohana AED
• ʻO ka wai kemika a me ka mālama ʻana i nā pilikia pilikia
• Nā pōʻino waʻa, kahuli ʻana, a me ke kanaka ma luna o ka moana
• ʻO nā au a me nā pilikia wai moana

Nānā ʻia nā kumu¶

• United States Consumer Product Safety Commission (CPSC, United States): Virginia Graeme Baker Pool and Spa Safety Act Guidelines and Guidelines for Entrapment Hazards: Making Pools and Spas Safer (Publication 363)
• ʻAhahui Kāohi ʻAi ʻAi ʻAi ʻAi ʻAla (ESDPA) a me National Fire Protection Association (NFPA, United States): National Electrical Code (NEC Article 680: Swimming Pools, Fountain, and Similar Installation; NEC Article 555: Marinas and Boatyards)
• American Boat and Yacht Council (ABYC) a me United States Coast Guard (USCG, United States): Equipment Leakage Circuit Interrupter (ELCI) Standards (ABYC E-11) a me Marina Electric Shock Drowning Investigations
• American Heart Association (AHA), European Resuscitation Council (ERC), a me UK Resuscitation Council: Nā Kūlana Kūikawā o nā Kūlana Hoʻōla (Drowning and Electrocution Protocols)
• Royal Life Saving Society (RLSS, United Kingdom and Australia) and World Health Organization (WHO): Global Report on Drowning and Aquatic Suction Entrapment Prevention