The RAG-79-G1 was a re-designed Aqua GM. The machine body was tuned for use by an ace pilot. It also incorporated design data from the Gundam Local Type, and because its head was designed to resemble that of the Local Type, it too became commonly known as a "Gundam" .
Underwater-Use Beam Rifle
A deflection-beam rifle (偏向ビーム・ライフル,deflection-beam rifle?). Presumed for underwater use, this specialized marine type rifle has a barrel with a shape that allows it to focus the beam precisely, there's also a removable rifle cover .
Among the Gundiver's weapons that are designed for use in the water are its Beam Picks (ビーム・ピック,Beam Picks?). Beam Picks are like Beam Sabers but with a shorter blade and the Gundiver has two Beam Picks that can be stored on its right waist .
The left arm is equipped with an Explosive Harpoon Gun (炸裂式ハープーン,Explosive Harpoon Gun?), which shoots out an explosive harpoon . The Harpoon Gun can be removed from the arm and used as a handheld weapon .
The right arm is equipped with a Hand Anchor that the Gundiver can shoot .
One Year War
In U.C. 0079, mid-October, on a day of foggy darkness, there had been an overwhelming difference in the number of Zeon and Earth Federation troops. It would only be a matter of time before Federation troops would break through the Bosphorus Strait, the entrance to the Black Sea. From underwater, "Gundam" type mobile suits had attacked .
After Zeon troops defended Odessa near the Bosphorus, a recording of the Gundam Marine Type was left behind .
Gundam Ace Magazine RAG-79-G1 Gundam Marine Type mechanical review 1
Gundam Ace Magazine RAG-79-G1 Gundam Marine Type mechanical review 2