How long can you hold your breath in Minecraft?

You can hold your breath in Minecraft for about 15 seconds. The air bar empties, and about a second later you start drowning: one heart (2 health) every second until you surface ^{[1, 2]}. From full health that gives you roughly 25 seconds underwater before you die. Below are the exact rules, what makes the time longer, and what an AI player’s drownings show about the traps that turn a swim into a death.

All game facts in this post are for Java Edition 1.21.x unless a line says otherwise.

How long can you hold your breath in Minecraft, exactly?

Your air is a hidden number shown as the row of bubbles above the hunger bar. While your head is underwater it drops by one every game tick, and there are 20 ticks in a second ^[2]. Without help, the bar takes 16 seconds to run out completely ^[2]. For mobs, the Damage page gives 15 seconds until the air is gone and 16 until the first hit ^[1]; either way, count on about 15.

Once the air reaches its bottom value, you take 2 damage, the air counter resets, and the cycle repeats every second ^[1]. With 20 health, the tenth hit kills you, so from a full bar and full health:

• about 16 seconds of breath;
• then 10 hits, one a second;
• about 25 seconds in all before death.

The game warns you. Each time a bubble pops you hear a pop, and the pitch rises as your air runs out ^[1].

What counts as being underwater

Drowning goes by your eyes, not your feet. Standing, your eyes are 1.62 blocks above your feet. Sneaking, 1.27. Swimming, crawling or gliding, only 0.4 ^[3].

That last number matters. You swim when you sprint while submerged ^[3], and in that pose your hitbox is only 0.6 blocks tall ^[3]. That’s what lets a sprint-swimmer slip through one-block gaps ^[4]. So a gap of air that would reach your face if you stood up may sit above your face while you swim. If you surface into a low pocket and the bubbles keep popping, stop sprinting.

How fast air comes back

Out of the water, or inside a bubble column, your air refills at one bubble every 0.2 seconds (4 ticks) ^[1]. That’s far faster than it drains, so a short breath at the surface goes a long way; you don’t have to climb out.

How to stay underwater longer

Respiration

Respiration is a helmet enchantment with three levels. Each tick there is a chance of level ÷ (level + 1) that your air doesn’t drop at all ^[2]. On average that stretches the 16 seconds to 32 with Respiration I, 48 with II and 64 with III ^[2]. Because the air also pauses between drowning hits, it slows the damage once you run out, too ^[2].

The search results for this question disagree on Respiration, with figures from 15 extra seconds per level to totals of 20, 25 and 30 seconds. The wiki’s own pages differ by a second: the Damage page says 15 seconds per level ^[1], the Water Breathing page says 16 ^[7]. The 16-second figure follows from the formula above.

Turtle shell

A turtle shell is a helmet made from turtle scutes. When you go into water it gives you 10 seconds of Water Breathing, and that recharges the moment your head touches air again ^[5]. It doesn’t recharge inside a bubble column ^[5]. It can carry Respiration too ^[2].

Potion of Water Breathing

Brew a pufferfish into an Awkward Potion. Add redstone dust to extend it ^[6]. It lasts 3 minutes, or 8 extended ^[6]. Water Breathing doesn’t just slow the air: it refills it underwater ^[7].

Conduit

A conduit is a block you place underwater inside a frame of prismarine blocks. It needs at least 16 frame blocks to switch on. Then it gives Conduit Power to every player touching water or rain within 32 blocks, and the range grows by 16 for every 7 more frame blocks, up to 96 with all 42 ^[8]. Conduit Power includes the effect of Water Breathing ^[8]. It’s the answer for long underwater builds, not for a quick dive.

Free air underwater: bubble columns and doors

You can refill without surfacing:

• Bubble columns. These are water currents made by soul sand (pushing up) and magma blocks (pulling down). Standing in either refills your air as fast as leaving the water ^[9]. Downward ones appear on their own over magma in underwater canyons ^[9], so a whirlpool is also free air, if you can get out of it.
• Doors. In Java Edition a door placed underwater makes a breathable space, because a door can’t hold water. In Bedrock Edition doors fill with water, so the trick doesn’t work there ^[10].

Drowned: the other way water kills

Drowned are zombie variants that live in water. They spawn in dark water in rivers, oceans and the aquifers of dripstone caves, and they also appear when a zombie stays underwater too long ^[11]. Most fight in melee, but some carry a trident: each naturally spawned drowned has a 6.25% chance of one ^[11]. A drowned with a trident throws it every 1.5 seconds, up to 20 blocks ^[11]. In Java a thrown trident does 5, 8 or 12 damage on Easy, Normal and Hard ^[11].

They’re neutral in daylight under some conditions and hostile at night and in thunderstorms ^[11]. A night swim in a river is where they find you.

Case study: how Nixi drowned

Nixi is an openly AI VTuber whose bot plays Minecraft 1.21.4 on its own, live on Twitch (how her bot works). These numbers come from her own logs and post-mortems.

How often. In run 1’s first 52 hours (to 2026-09-29 20:32) she drowned 8 times out of 94 deaths. Her death log from 2026-10-01 to 2026-10-09 records 11 more drownings, 10 in the Overworld and 1 in the End, plus 3 deaths to drowned mobs, two of them by trident.

Her log shows the 2-per-second rule plainly. On 2026-10-03 at 06:05 she went from 12 health to 0 in about six seconds, at 2 health a hit. None of her drownings came from a long swim. Each was a trap she couldn’t see her way out of, and her rig’s code notes each fix:

1. A pocket under a tree (2026-10-03, 06:05). She was fishing in a water pocket under a tree. The way out was a one-block-high gap beside her, level with her head, but she swam up and pressed against the grass block above it. The fix: when the nearest air is level with her head, move sideways, not up.
2. Her own hiding hole (2026-10-03, 17:38). Hurt after a creeper blast, she dug in to hide in shallow water and put a dirt lid over herself. The water filled the hole. Her post-mortem blamed missing armour, which couldn’t have helped against drowning ^[1]. The fix: never dig in where water touches the hole.
3. Sprinting into a low pocket (2026-10-04, 00:23). Mining at y 22, she came up into a one-high air pocket under rock while sprinting. The server put her in the swimming pose, with her eyes 0.4 above her feet ^[3], so her feet stayed in the water and her eyes stayed under. The fix: the air reflex never sprints.
4. A flooded tunnel (2026-10-04, 16:05). Tunnelling at y 9, she scooped one water source with her bucket and her reflex called it done, with her head still underwater. The next try started with no air. The fix: under a ceiling, she heads for air at 12 air instead of 6, and a scoop only counts once her head is out.
5. A lake bed (2026-10-05, 17:35). After a zombie fight at 4.8 health, her air reflex ran for six seconds without pressing a key. The fix: swim up first, then think.

One more, in the End, on 2026-10-03 at 14:08: the dragon’s breath had already taken most of her health, and the water from her own bucket finished her in a sealed hole. The fight itself is in how to beat the Ender Dragon.

The same kind of edge-and-hazard thinking keeps her alive in the Nether, where the liquid is lava: see how to survive the Nether.

FAQ

How many seconds can you stay underwater in Minecraft?

About 15 to 16 seconds before the air bar runs out, then 2 damage a second ^{[1, 2]}. From full health that’s roughly 25 seconds before you die.

How long does Respiration III let you breathe underwater?

About 64 seconds on average before your air runs out, against 16 without it ^[2]. With a turtle shell it’s 10 seconds more ^{[2, 5]}.

Does armour protect you from drowning?

No. Armour points have no effect on drowning damage; Protection and Resistance reduce it ^[1].

How do you breathe underwater in Minecraft without potions?

Swim into a bubble column, place a door to make an air pocket (Java Edition only), wear a turtle shell, or build a conduit ^{[9, 10, 5, 8]}.

How fast do air bubbles come back?

One bubble every 0.2 seconds, out of the water or in a bubble column ^[1].