LEGO Technic 42201 Deep-Sea Research Submarine

LEGO Technic 42201, Deep-Sea Research Submarine, depicts a deep-sea research submarine. Released in 2025 in the Technic theme, it contains 413 pieces and focuses on a scientific underwater vehicle rather than character-based play.

Set 42201 is based on a research submarine, a subject that fits the LEGO Technic emphasis on vehicles, mechanisms and specialist machines. The model therefore sits within the core Technic theme, using an exploration and science subject rather than a narrative franchise.

It is suited to builders who want a compact Technic vehicle with a clear scientific theme. The model can support play scenarios about underwater research, work as a display piece, or sit in a Technic collection alongside other specialised vehicles and machines. Its identity is defined by the submarine subject rather than by figures or licensed characters.

Inventory of set 42201

The inventory of set 42201 lists 413 pieces, spare parts excluded: 111 different lots (one shape in one color) for 100 part shapes. The box also contains 10 spare parts, for small elements that are easy to lose.

Colors of set 42201

Main color: black, making up 30% of the parts, followed by red (12%) and yellow (12%).

Part types

Most common parts in set 42201

95 of the 100 part shapes in this set have their own page on Setopedia, with their colors, element numbers and the other sets that use them. See all LEGO parts

Exclusive parts in set 42201

One part shape in set 42201 appears in no other set in the catalog, most often a printed element, a sticker or a mold specific to the model. If it gets lost, you will need to look for it individually, for example on BrickLink, rather than in another set. Counting colors, 10 lots in the set are not found in any other set.

Rebuilding set 42201 from another set

Share of the parts of set 42201 found in each of these similarly sized sets, counting shape, colour and quantity:

No similarly sized set goes above 49%: the model relies on a little-shared assortment, most of which has to be gathered piece by piece.

Size of set 42201 within its line

With 413 pieces, set 42201 ranks #215 out of 443 Technic sets in our database, which have an average of 658 parts. Among the 625 sets released in 2025, it ranks #245.