Prime force of Zeon embarks on the development of mobile suits capable of acting in the underwater environment, which can operate in the ocean covering the earth, at the time of the invasion of the earth after the opening of the one year war. In developing the underwater mobile suits, a prototype was built based on "MS - 06F Zaku II" for airtight space, and it was called "MS - 06M Underwater Zaku". Prototype emphasizes the ability to move in the water, equipped with a backpack equipped with a water-jet engine, and an auxiliary propulsion machine is placed in the arm and the leg. Furthermore, ballast tanks for posture control under water and floating and sinking of the aircraft were added.
Although improvement of such an aircraft was advanced, problems arise also because it is based on "MS - 06F Zaku II". It was found that when underwater operation experiment was carried out, it was inevitable to inundate water to the joint part. Although the sealing for waterproofing is applied to the moving part, it did not become a big solution to the problem. Also, it became a problem that the shape itself based on "MS - 06 F Zaku II" becomes a large resistance when underwater behavior. From this result, it was decided that amphibious mobile suits are required to design and develop on the premise of shape and joint mechanism with low resistance in water.
Based on these results, "MS-06M Underwater Zaku" which was born as a prototype was the main task to collect data for amphibious mobile suits development.
The five prototypes produced are deployed in the North Atlantic submarine team <Sea Serpent> and equipped with underwater sub block guns, Brownie M 8 type 240 mm 4 interlocking rocket pods, etc., operational data was collected It was. In addition, two machines are increased and redeployed to test special anti - ship weapons in each diving fleet of the Zeon army deployed around the globe. Two of them were sent to the <Red Dolphin> Corps, each one was sent to the <Green Siren> Corps and <Naga III> Corps, <Mantarray> Corps, and two aircraft left in the Sea Serpent Corps It was done.
After that, "MS-06M Underwater Zaku" solved from the task of collecting operational data by completing the amphibious mobile suit is reclassified as an amphibious mobile suit and the model number of "MSM - 01" is given It will be. And in the latter half of the one-year war, in the "Mediterranean landing invasion strategy" where Zeon Duke army soldiers who lost in Odessa operation merged into the African front across the Mediterranean, by the Red Dolphin team that helped transport and escape Actual introduction was also made.
After the war, "MS-06M Underwater Zaku" was taken over by the Earth Federation Army and recorded as "Marine · Haizack" operated as a cockpit or a frame changed during the Grips War.