How many pieces are in the Underwater Adventure?

Underwater Adventure contains 310 pieces.

What age is the Underwater Adventure recommended for?

This set is recommended for ages 8+.

When was the Underwater Adventure released?

Underwater Adventure was released in 2026.

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No. 21598

Minecraft

Underwater Adventure

Underwater Adventure is a fantastic slice of digital gaming brought into the physical brick world.

Time on the shelf Current release

On sale since Jun 2026, expected exit Dec 2027

View on LEGO.com

Before you buy

Who it's for: Ages 8+ · Beginner build Perfect for younger builders, kids ages 8 and up, and casual Minecraft fans
Build: 310 pieces · about 1 hours Build time is an estimate.
Cost: Affordable Next to other LEGO sets. Check the store for today's price.
Availability: Current release · expected exit Dec 31, 2027

Not the set you remember? Describe it in Set From Memory

★★★★☆ 4.1 AI-generated review score, not a customer rating

Fans love the inclusion of unique aquatic mobs and the rare Deep Sea Diver minifigure at a budget-friendly price, though some note the build itself is a bit straightforward and compact.

📝 Our Take

Underwater Adventure is a fantastic slice of digital gaming brought into the physical brick world. Capturing the often-overlooked aquatic biomes of Minecraft, this set delivers a vibrant mix of coral, ocean ruins, and the intimidating ocean monument in a compact, display-friendly footprint.

This set is perfect for younger Minecraft fans and builders looking for a quick, colorful construction experience. Coming in at a modest 310 pieces and featuring a generous lineup of three minifigures plus several aquatic mobs, it offers immediate play value right out of the box without demanding a massive time or financial investment.

Skip this if you are an adult fan of Minecraft hoping for a massive, display-piece scale ocean monument. At just 20cm wide, this is primarily designed for play and younger builders rather than hardcore AFOL shelf displays.

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🧱 Building Experience

🧩

310

Pieces

⏱

1.0h

Estimated Build Time

📊

Beginner

Difficulty

📏

20cm × 7cm × 9cm

Dimensions

Build Highlights:

Quick and straightforward build process suitable for younger fans
Colorful use of sand green, tan, and bright pink pieces to recreate coral reefs
Includes a fun boat and map accessories for roleplay adventures
Great variety of aquatic mobs and figures packed into a small set

⚖ Compare Similar Sets

The Nether Portal Ambush

Minecraft • 352 pcs

The Pirate Ship Voyage

Minecraft • 166 pcs

The Armory

Minecraft • 203 pcs

While standard Minecraft sets lean heavily into caves or surface villages, this set offers a refreshing change of scenery with a strong mob selection that rivals sets twice its price.

3 Minifigures Included

Steve, Nougat Face, Lavender Helmet and Armor

5 parts

Deep Sea Diver

3 parts

Zombie, Sand Green Head (Drowned)

3 parts

The set packs an impressive three figures—Steve in his lavender armor, a specialized Deep Sea Diver, and a Drowned zombie—plus several buildable aquatic mobs like the guardian and elder guardian.

📦 Parts Inventory

Official piece count: 310
Parts cataloged in this inventory: 76 unique parts, 299 pieces
Minifigures: 3

The official piece count includes the 11 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

Missing a piece? Check this set piece by piece, with look-alike colors flagged and element IDs for replacements.

A solid parts pack for builders looking for natural tones, featuring useful quantities of sand green bricks, tan plates, and vibrant pink and azure elements ideal for coral reef MOCs.

🛒 Where to Buy

LEGO.com

See the set at the store

💎 Notable Parts

Sand Green Brick 1 x 4 (8x)

Sand Green Brick 2 x 2 (8x)

Medium Azure Plate Round 1 x 1 with Solid Stud (6x)

Bright Pink Plate 1 x 1 (4x)

💡 MOC Potential

🌳 Aquatic MOC expansions and coral reef dioramas

🚢 Shipwreck wreckage scenes and sunken treasure builds

🏙 Custom Minecraft biome integrations and custom terrain building

From the community

Community Insights

Real opinions from Reddit and YouTube

What Reddit Says

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Building Instructions

2 booklets, as PDF

01 BI 3101, 80+4, 21598 V29 Download PDF
02 BI 3101, 80+4, 21598 V39 Download PDF

Inventory Statistics

Inventory version 1

76 Unique Parts

310 Official Piece Count

299 Cataloged Inventory Pieces

3 Minifigures

The official piece count includes the 11 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

Missing a piece? Use the Missing Piece Checker.