OverviewLet young science and engineering fans create their own deep-sea adventures with the LEGO Technic Deep-Sea Research Submarine 42201 Building Set. This creative building set includes lots of realistic features like the rotating propellers and grabbing arm to help kids explore how submarines work. The transparent cockpit opens to give access to the seat and controls. The set comes with a barrel accessory, which kids can pick up using the submarine’s extending grabbing arm. This set makes a fun gift idea for kids who like exploring science and engineering toys or anyone who is interested in submarines and deep-sea exploration. Discover intuitive instructions in the LEGO Builder app, where builders can zoom in and rotate models in 3D, track their progress and save sets as they develop new skills. LEGO Technic sets feature realistic movement and mechanisms to introduce young LEGO builders to the universe of engineering. A 413-piece set with a model measuring over 6 in. (15 cm) high, 9.5 in. (25 cm) long and 6 in. (15 cm) wide.