Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece
and leave with the element ID LEGO asks for, or a link to buy the part.
583 pieces in 218 part and color combinations, plus 3 minifigures.
The piece count includes the 16 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.
Before you call it missing
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
Look-alike colors in this set
These parts appear in this set in two colors that are easy to confuse. If you are one short in one color,
check whether it went in where the other color belongs. Each color has its own element ID in the parts list
at the back of the instructions.
Plate Round 1 x 1 with Solid StudRed ×2Trans-Red ×14Trans-Red is see-through: hold the piece up to a light.
Tile Special 1 x 2 Grille with Bottom GrooveRed ×1Trans-Red ×2Trans-Red is see-through: hold the piece up to a light.
Bracket 1 x 2 - 2 x 2Black ×1Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Brick 1 x 4Black ×3Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Cone 1 x 1 [No Top Groove]Black ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Plate 1 x 2Black ×8Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
4 more look-alike pairs
Plate 1 x 6Black ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Plate 2 x 3Black ×2Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Wedge Plate 4 x 2 LeftBlack ×4Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Wedge Plate 4 x 2 RightBlack ×4Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Projectile, Technic Competition Arrow, Liftarm Shaft with Hollow Black Rubber EndLight Bluish GrayPart 57028c01Element 4299625×1
Rock
2 pieces
Rock 1 x 1 Jewel / Gem 24 FacetTrans-Light BluePart 30153Element 6513972 or 6247792×1
Rock 1 x 1 Jewel / Gem 24 FacetTrans-Neon GreenPart 30153Element 6247790 or 4114505×1
Technic Bushes
2 pieces
Technic BushLight Bluish GrayPart 3713Element 6275844 or 62718171 spare in the box×2
Transportation - Land
2 pieces
HandlebarsBlackPart 30031Element 3003126×1
Seat / Chair 2 x 2BluePart 4079×1
Tubes and Hoses
2 pieces
Flexible Hose 8.5L with Tabbed Ends Black (Ends different color than Tube)YellowPart 73590c02b×2
Windscreens and Fuselage
2 pieces
Windscreen 10 x 6 x 2 CurvedYellowPart 45705Element 4503727 or 4194210×1
Windscreen 8 x 4 x 2 Curved [2 Dual-Fingered Click Hinges]YellowPart 46413Element 4583915 or 4501969×1
Containers
1 piece
Barrel 2 x 2 x 2Reddish BrownPart 2489Element 6605306 or 6278989×1
Flags, Banners and Signs
1 piece
Flag 5 x 6 Hexagonal with C ClipsYellowPart 51000Element 4257525×1
Minifig Headwear
1 piece
Helmet, Standard with Blue Trident Print [Aquaraiders II]BlackPart 2446pr0023Element 4500440×1
Minifig Headwear Accessories
1 piece
Headwear Accessory Visor / Diver's MaskTrans-Light BluePart 30090Element 6244761 or 45691331 spare in the box×1
Minifig Neckwear
1 piece
Minifig Neckwear Scuba Airtank, Bar HolderDark Bluish GrayPart 30091bElement 6269982 or 4500608×1
Panels
1 piece
Panel 1 x 4 x 3 [Hollow Studs]Trans-Light BluePart 4215bElement 3000742×1
Stickers
1 piece
Sticker Sheet for Sets 7774-1, 7775-1[No Color/Any Color]Part 58840Element 4501861×1
Minifigures
3 figures
Skeleton, Evil Face, Ball Joint ArmsMinifigure, checked as a whole figure×1
Aquaraider Diver 8Minifigure, checked as a whole figure×1
Aquaraider Diver 5 with Dark Bluish Gray HatMinifigure, checked as a whole figure×1
Tick each piece as you find it, or mark it missing.
When a piece really is missing
Ask LEGO
LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for
the set number and each piece's element ID, the number printed beside the piece in the parts list at the back
of the instructions. This checker lists both.
Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from
older or second-hand sets.
Keep a record
Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick
pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.