6195 Neptune Discovery Lab / Aqua Dome 7 6195 Neptune Lab , also known as Aqua Dome 7 is an " Aquazone " set released in 1995 . It contains an underwater base of the " Aquanauts " , an exploration submarine and four minifigure s . This is also the biggest " Aquanauts " set and also the only base of this faction . Description . The Aqua Dome 7 is built upon two raised Baseplates and consists of a large main complex , a separate control tower , a docking pad for the submarine and a small refueling station . The main section contains a spacious room with large windows at the rear and can be accessed through two smaller hatches and the large transparent doors at the front . The hatches on the side are each relatively hidden from view by rock formations . The more visible one has a keypad ( which the Minifigures would punch in to unlock the door ) . Both of them have propellers on them which can blast intruders with water . On the roof is a crane ( the only underwater one released ) with a control station next to it . It has a clamshell attachment at the end , and this is the only set in which is is Transparent Blue . It is controlled with a Control Panel above the conveyor belt , and right next to it is a weapons rack and a pair of Diving Flippers . The crane can be used to scoop out crystals from the cargo bay of the sub to drop them onto a conveyor belt which is adjacent to the main complex . On the left of the conveyor belt is an antenna , and there are arrows pointing in both directions . It also uses Transparent Blue parts which allow viewing inside of the conveyor belt . From there the crystal can be moved to either a magnetic storage box or into the main room where the Aquanauts can examine them on a small platform . The platform has a smooth surface , so that the crystals slide on it easily . It can be angled downwards , allowing them to slide down . From there they slide into a small pit . To retrieve them , the " cage part " and the part below it can be lifted , allowing the crystals to slide out . On a rock in front of the base lies a refueling station with a hose and a magnetic storage box . The top part opens , allowing the magnetic storage box to be removed . It has a propeller on top of it , which could be used to propel aquanauts up quickly or two blast water at an invading vehicle . A crystal is meant to be placed in the storage container . It is placed directly in front of the complex , in the dead centre of the two Baseplates . On either side of it are the " underwater road " shaped parts of the Baseplate , which perfectly fit a small Aquasharks Set or one of the smaller Aquanauts sets . On the left side of the base is a turret / control tower . It has a large Transparent Blue top and the bottom is almost entirely Yellow . The top opens , allowing ample room for an Aquanaut to swim in or out , or even a Shark or Octopus . Inside the tower is a control panel and a weapons rack . There is also a large amount of room for Magnetic Storage Containers to be placed . The turret is not connected to the main complex . Right next to it is a large Red and Green bush . The submarine has a cockpit with a cargo bay behind it and is equipped with two robot arms , one with a claw , the other one with a magnet . The cockpit has just enough room for one Minifigure to stand . It opens with a hinge , allowing the top part to open . It has a small slot behind the pilot , allowing more Magnetic Storage containers to be placed inside . On the top is an antennae , which can be angled , along with two lights , and flaps . The cargo bay is covered by four hinged panels and is actually quite small , so that Minifigures transported inside have to lie there horizontally . It also can be used to store Magnetic Storage Containers and Crystals . Opening the cargo bay also allows the section on which the propeller is to be opened , showing a small storage space . It is an ideal place to store up to 10 small Daggers or Harpoons . Like many other Aquazone vehicles , the submersible has a compass on it . It is Yellow and Black , with some Transparent Blue and Orange . It also has detachable Harpoons on the side which carry Diving Flippers . On the bottom are a pair of pontoon - shaped parts , which could be rockets / lasers or part of the propulsion system . The set also includes two magnetic storage boxes , three crystals and an octopus . The Minifigures are all equipped with typical Aquanaut diving gear . One is the Aquanaut commander , who has a Blue visor , while the other 3 have Black visors . There are many places on the set on which Diving Flippers are placed , and many other places to place Silver Knives and Harpoons . The Octopus is a typical Black octopus . Background . The Neptune Discovery Lab is the base of the Aquanauts in their fight against the evil Aquasharks . Along with it is their second largest vehicle .