Mission 323
The Plumber’s Trick: An Airlock That Never Leaks
Badge: Master Plumber
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Dig a U-bend tunnel under the dome wall so you can swim in and stay dry.
No more climbing the snorkel. You need a front door under the sea… that the sea can't get through.
- New skill Building a U-bend water lock
- Level 4 · Legends of the Deep
- Difficulty Intermediate
- Mode Survival
- Time 30–45 min
- Ages 13+
What you’ll build
You need a front door under the sea that the sea can't get through. Sketch a U-bend, dig down inside the dome, tunnel under the wall and then up to the seafloor. Add ladders and a trapdoor, then time your swim in.
Finish line: Your U-bend airlock lets you swim into the dome and climb out dry, with no water following you in.
Bonus challenge: Build a second, sneakier entrance on the far side, hidden behind a wall of kelp. Can anyone find both doors?
You’ll need
- Ladders
- A trapdoor
- A pickaxe
- A shovel
- A stopwatch
You choose
- My airlock's name
- Secret marker for the outside door
- My bet: will any water get in?
Stuck?
- Dome flooding? The tunnel must dip below the dome floor; water spreads sideways and down but never up.
- Ladders won't place? They need a solid block behind them.
- Can't find the door at night? Mark the outside entrance with something bright.
For grown-ups
Get this mission
This mission is in Mission Pack 32. Each printable has the full steps, a Plan & Log page and a parent page.
Print one mission at a time. You never need to print everything.
Played on Minecraft Bedrock on iPad. Buttons can differ on other devices and versions.