Quick Summary: Do not memorise banned games — score the game in front of you. Ingredient 1: it rewards staying under longer or going farther. Ingredient 2: it starts with a breathing ritual — big breaths, “breathe up”. Ingredient 3: it makes a still child on the bottom look like a normal part of play. One ingredient means allow it with a limit said out loud to the children; two or more means the game ends. The child most at risk is the strong swimmer, because they win. And the usual drowning warning signs will not help you here: a hypoxic blackout never reaches the surface, so every scan needs a two-second sweep of the pool floor as well as a head count.

🧵 Why a list of banned pool games stops working by lunchtime

The standard advice on underwater play is a list: no breath-holding contests, no dunking, no chicken fights. It is good advice and it has a structural problem. A list only covers games somebody has already thought of, and children at a pool are relentless inventors — usually by welding two familiar games together and giving the result a new name.

So by the second hour of a party, the children are playing something that is not on anybody's list, and the adults have no way to judge it except instinct. Instinct is not reliable here, because the most dangerous underwater games look like the safest ones. They are quiet, they are orderly, and they are usually being won by a child who swims well.

What travels better than a list is a test with a small number of parts. Our guide to which pool games are genuinely safe works through the named games in detail; this page is about the rule underneath them, so you can score a game that has no name at all.

🧪 The three ingredients that make an underwater game dangerous

Ingredient 1 — the game rewards staying under longer or going farther. Anything scored by duration or distance: who lasts longest, how many widths, beat your record, one more than last time. The scoring is the hazard. A child chasing a number will push past the point where they would otherwise have come up, and the number always creeps.

Ingredient 2 — the game begins with a breathing ritual. Big breaths, deep breaths, “breathe up”, or any coaching about how to prepare before going under. This is the specific physiological mechanism rather than a general caution, and it is worth understanding properly — our explainer on why hyperventilating before swimming is dangerous covers it in depth.

Ingredient 3 — the game makes a still child on the bottom look normal. Underwater hide-and-seek, statues, dead man's float, sinking-toy hunts with several children down at once. This is the ingredient adults almost never count, and it is the worst of the three, because it does not make the child more likely to black out — it makes the blackout impossible to notice. It disables the rescue.

Score the game on the three, then apply the rule. One ingredient: allow it, with a limit you say out loud to the children before play starts. Two or more: the game is over, and you name a replacement in the same breath, because a banned game with nothing to take its place comes back within ten minutes.

💨 Why the strong swimmer is the one at risk

Most water safety attention goes to the child who cannot swim, and reasonably so. Underwater games invert that. The child who holds their breath longest wins the contest, goes farthest on the dare, and is trusted most by the adults watching — and that combination is exactly the risk profile.

The mechanism is not lack of willpower or lack of skill. The urge to breathe is driven by carbon dioxide building up in the blood, not by oxygen running low. Deliberate over-breathing beforehand flushes carbon dioxide out, so the alarm that would have sent the swimmer to the surface arrives late, or does not arrive at all. Oxygen keeps falling in the meantime, and consciousness can go without any warning the swimmer can feel. Our full explainer on shallow water blackout covers the physiology and the case pattern.

Two terms describe the same event. “Shallow water blackout” is the phrase most families have heard; hypoxic blackout is the term the governing bodies now prefer, because the depth of the water is not what causes it — children have blacked out in water shallow enough to stand in.

This is not a house rule invented by cautious parents. The American Red Cross, USA Swimming and the YMCA of the USA issued a joint statement, first in 2015 and updated in 2022, calling on aquatic programmes and facilities to prevent hyperventilation and extended breath-holding. Three organisations that between them run a very large share of American learn-to-swim and competitive swimming agreed on this in writing.

🔴 The games that are red at every age and every skill level

Some games carry two ingredients by design and there is no version of them that gets to green. Breath-holding contests — in the water or sitting on the steps — carry Ingredients 1 and 2. Underwater distance races and repeated no-breath widths carry the same pair with fatigue stacked on top. Any game with a deliberate breathe-up is red even for a single short trip in the shallow end, because the preparation is the mechanism, not the depth.

Dunking, however playful, is red for a different reason: it teaches a child that somebody else controls when they next breathe, and it puts water in an airway quickly when a child panics. Underwater hide-and-seek is red because of Ingredients 1 and 3 together — the version where a motionless child on the bottom is the whole point of the game. And weighted objects carried underwater are red because anything that slows the return to the surface removes the margin the child was relying on.

These same rules hold in engineered water, where the noise and the crowd make the bottom harder to see — worth reading alongside our wave pool safety guide if a waterpark day is coming up.

🟡 The games that are fine once you remove the scoring

Plenty of underwater play is good for a child, and some of it is the same skill a lesson is building. Retrieving a sinking dive toy, swimming a width underwater, somersaults and handstands, opening eyes, blowing bubbles, bobbing — these carry at most one ingredient, and usually the one you can take away.

The limit is what makes them green, and the limit has to be specific enough for a child to repeat back. “One toy, then up” works. “Be careful down there” does not, because it names no behaviour. One object per trip, a surface between every attempt, nobody counting or timing, and one child under at a time when several toys are down.

Underwater swimming itself is not the enemy — our guide to whether underwater swimming is safe for kids makes the case for it as a developmental skill. What turns it is the scoring, the breathe-up, and the crowd.

One caution on re-scoring: the same game can be green at your pool and red at the neighbour's. Ingredient 3 depends on how many children are in the water and how clearly you can see the pool floor, so a game you allowed on a quiet Tuesday should be scored again at a crowded party, in a cloudy pool, or after dark. The same logic sits behind our pool playdate safety checklist for swimming at somebody else's house.

👂 Six phrases from the deck that mean stop the game now

You will usually hear the problem before you see it. “Take a big breath first” is the most dangerous sentence said at a pool, and it is almost always said kindly, by an adult who is trying to help. “Let's see who can stay under longest” is Ingredient 1 out loud. “One more than last time” means a record is being kept and the limit is now moving.

“Count for me” turns any activity into a contest, whether the counter is a phone timer or a child chanting numbers. “He's just hiding” is Ingredient 3 in five words — check anyway, every time, and do not apologise for it. And “she's a really strong swimmer”, offered as a reason to relax, is the opposite of one.

👁️ The bottom sweep — what the surface scan cannot find

Here is the part that matters most, and it is the reason this hazard needs its own card rather than a line in a general checklist. Everything parents are taught about recognising drowning is a surface skill: the vertical body, the head tipped back, the mouth at water level, the arms pressing down, the absence of shouting. Our drowning warning signs card teaches it because it is genuinely the thing that saves most children.

A hypoxic blackout does not produce any of it. The swimmer stops, and settles. There is no splash to draw your eye, no arm to see, no head at the surface at all. An adult performing a perfect surface scan can look straight over the top of it for several minutes.

So add one movement to the scan. Count heads, then sweep the bottom — eyes along the floor of the pool, end to end, on every pass. It takes about two seconds and it is the only habit that finds this. Any child on the bottom gets checked, every time, with no benefit of the doubt.

This sits on top of a named water watcher rather than replacing one. If you do not already run a watcher rotation, our printable water watcher card is the place to start — then teach the bottom sweep to whoever takes the next shift, because the watcher card alone has them scanning for a struggle that is never going to happen. A lifeguard on duty does not remove this job either: a guard scans a whole pool, you scan your child, and both of you can miss a still body that the game explained away.

🚨 What to do if a child is found still underwater

Get them out and face-up immediately, shouting for a second adult as you go rather than leaving to find one. Have a named person call 911 — point at one adult and use their name, because “somebody call 911” is how nobody calls. If they are not breathing normally, start CPR and keep going until they respond or help takes over; rescue breaths matter in drowning because the emergency began as a lack of oxygen. Our guide to CPR and water rescue basics for parents walks through the sequence, and it is worth reading before you need it rather than after.

There is a quieter version of this that families miss. A child who surfaces dizzy, tingling, confused, or who blacked out even briefly, is seen by a doctor that day — even if they seem completely fine five minutes later. And swimming ends for everybody afterwards, because the adults will not be scanning properly for the rest of the afternoon and the children will not be holding to limits.

🖨️ Get the free printable underwater games safety card

One page for the swim bag. The card holds the three ingredients written as a ten-second test, the red list and the yellow list with their limits, the six deck phrases that mean stop, the bottom sweep spelled out for whoever is on watch, the response if a child is found underwater, a grid for scoring the games you actually see today, and a family rule line to fill in and keep.

It is built to be read out loud to the children before anyone gets in — and to be handed to the visiting adult who says “oh, they're fine”.

Open the printable underwater games safety card →

One thing sits underneath all of it. Breath-hold endurance is the most misread signal at any pool: it looks like competence, and it is the trait most associated with these deaths. What actually protects a child is a taught sequence — getting to the surface, rolling onto the back, floating and breathing, then reaching an edge — built in lessons and practised calmly. That is the skill worth being proud of, and it is not the one that wins the contest. Our water competency skills checklist sets out what that sequence actually contains.

📚 Authoritative Sources

Frequently Asked Questions

Which underwater pool games are safe for kids?

Sort the game rather than memorising a list. Three ingredients make an underwater game dangerous: it rewards staying under longer or going farther; it has a breathing ritual before it starts, such as taking big breaths; or it makes a still child on the bottom look like a normal part of the game. One ingredient means allow it with a limit you say out loud. Two or more means stop the game. Retrieving one dive toy per trip, a single width underwater followed by a rest, somersaults and handstands are fine once the timing and counting are removed. Breath-holding contests, underwater distance races, dunking and underwater hide-and-seek are not.

Why are breath-holding contests dangerous even for strong swimmers?

The urge to breathe is triggered by carbon dioxide building up, not by oxygen running out. Taking rapid deep breaths before going under lowers carbon dioxide, so the urge to breathe arrives late or never — and a swimmer can lose consciousness underwater before their body ever warns them. This is called hypoxic blackout. Strong, confident swimmers are over-represented because they hold their breath longest, win the contest, and are the children adults worry about least. The American Red Cross, USA Swimming and the YMCA of the USA issued a joint statement, first in 2015 and updated in 2022, calling on aquatic programmes and facilities to prevent hyperventilation and extended breath-holding.

What does hypoxic blackout look like from the deck?

It looks like nothing. There is no thrashing, no call for help, no splash. A child doing something they have done a hundred times simply stops and settles to the bottom, still and quiet. Every drowning warning sign parents are taught — the vertical body, the head tipped back, the arms pressing down — is a surface sign, and a hypoxic blackout never reaches the surface. That is why it is missed by adults standing a few feet away.

Is underwater hide-and-seek safe if an adult is watching?

No. Underwater hide-and-seek carries two of the three ingredients at once: it rewards staying under longer, and it makes a motionless child on the bottom the expected state of play. The second one is what makes adult supervision fail, because the watching adult sees exactly what the game told them to expect and does not look twice. Children have died in this game with friends and adults an arm’s length away.

How do I watch for this when I am already watching the water?

Add one movement to every scan: count heads, then sweep the bottom of the pool with your eyes, end to end. It takes about two seconds. A named water watcher with no phone is the right foundation and is still not enough on its own here, because the watcher is scanning for a struggle that will never happen. Any child on the bottom gets checked every time, with no benefit of the doubt — the cost of being wrong is one embarrassed child.

Are diving toys and retrieving objects from the bottom a problem?

Not in themselves. Diving-toy retrieval is one of the better underwater activities, and it becomes a problem only when scoring is added — how many toys in one trip, who gets the most, how fast. Remove the counting and the first ingredient goes with it. Keep to one object per trip with a surface between attempts, and if several toys are down at once, only one child goes under at a time with an adult whose whole job is that child.

What should I do if my child surfaces dizzy or says they nearly blacked out?

Get them out of the water and keep them out for the day, and have them seen by a doctor that day even if they feel completely fine within minutes. Dizziness, tingling, confusion or any brief loss of consciousness after breath-holding is a warning that the episode came close, and the same swimmer will often try again if allowed back in. If a child is found still underwater, get them out face-up, have a named person call 911, and start CPR with rescue breaths if they are not breathing normally.

Do swim lessons teach children to hold their breath for longer?

A good lesson teaches breath control — blowing bubbles, exhaling underwater, bobbing, comfortable short submersions — which is the opposite of breath-holding endurance. If a school uses prolonged breath-holding or repeated no-breath distance work as training or as a reward game, that is a reason to walk, not a sign of a demanding program. Breath-hold endurance looks like competence and is not; what protects a child is a taught sequence of getting to the surface, rolling to the back, floating, breathing and reaching an edge.