LEGO Technic Deep-Sea Research Submarine set for boys and girls aged 9 and over The LEGO Technic Deep Sea Explorer Submarine (42201) allows children to discover the exciting secrets of the oceans. The toy submarine has is packed with features that can also be found on real submarines, such as steering controls, 3 rotating propellers, 3 air tanks and a cockpit with seat and controls. The vehicle has an extendable arm that allows it to grab the included barrel and lift it on board. This model submarine belongs to a series of LEGO Technic sets and construction toys that faithfully recreate the movements of real vehicles to bring young builders closer to the world of technology. The playset is a great gift for children who like to play with buildable vehicles. The LEGO Builder app offers your child an easy and intuitive building adventure. Kids can zoom in and rotate 3D views of the models, save sets and track their build progress.