Mission 321
Bubble Base Blueprint: A Glass Dome Under the Sea
Badge: Dome Architect
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Scout a seafloor site, plan a glass dome and guess how much glass it needs.
Down on the seafloor there's a perfect spot for a secret base. One problem: it's full of sea. Plan the dome.
- New skill Building a dome layer by layer
- Level 4 · Legends of the Deep
- Difficulty Intermediate
- Mode Survival
- Time 40–50 min
- Ages 13+
What you’ll build
There's a perfect seafloor spot for a secret base, but it's full of sea. Sketch a glass dome, work out each layer's size, then fire up a glass factory. Dive to lay the first ring and check whether your glass estimate holds up.
Finish line: Your dome's bottom glass ring sits on the seafloor and you know how much glass the full dome needs.
Bonus challenge: Build a mini test dome (radius 3) on the beach first. Count every block and use it to sharpen your big guess.
You’ll need
- Sand
- A furnace
- Dried kelp blocks
- A boat
- A calculator
You choose
- My base's code name
- Dome style: clear glass or tinted with
- My bet for the total glass: ___ blocks
Stuck?
- Out of breath? Mark the centre first, then surface for air every few blocks.
- Dome leaking later? Fill the ledge wherever a layer steps inward, as water finds every gap.
- Found a giant spiky stone palace? Swim away for now: that's a later mission with a family member.
For grown-ups
Get this mission
This mission is in Mission Pack 32 (Level 4: Legends of the Deep). Its printables arrive in the store soon. We release about one level a month.
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.