There are a number of kits in the LEGO City Deep Sea Explorers series. They include the following:
LEGO City Deep Sea Starter Set – this is a small kit that contains a remote sub with 2 movable robotic arms. There are also a few other accessories.
LEGO City Deep Sea Explorers Exploration Vessel Building Kit – Comes with the Exploration vessel, a shipwreck, a working winch, large wheelhouse, below-deck cabins, a lifeboat and a submarine. Lots of extra accessories.
LEGO City Deep Sea Explorers Submarine Building Kit – Build a Deep Sea Submarine that you can use to find a treasure chest. Use the sub’s robotic arms to retrieve the chest.
LEGO City Deep Sea Explorers Helicopter Building Kit – Features a helicopter and a submarine that you use to find and retrieve treasure from the ocean floor.
LEGO City Deep Sea Operation Base – This kit features a seaplane with spinning propellers and a cargo bay with opening doors. Includes the operations base, a flat-bed submarine and a research sub.