Submarine 707R

To maintain peace across the oceans, the international coalition PKN was established, comprising state-of-the-art battleships from various nations. However, during their founding ceremony, the organization was ambushed by USR, an unidentified group plotting world domination. The PKN fleet proved ineffective against the advanced submarine UX, commanded by Admiral Red of the USR. Salvation came from an unexpected aging Japanese submarine, the 707, whose captain, Hayami, risked his life to intervene and save the day. One year later, following the destruction of the original vessel, the newly developed Submarine 707 II set sail. Its crew included former trainees such as Kenji, Goro, and Senta. The PKN assembled a new fleet led by the Great Guardian, the United States' latest battleship, but they were severely defeated by the relentless attacks of Submarine U. Just as hope seemed lost, the 707 arrived on the scene. Upon spotting his old rival’s vessel, Admiral Red welcomed the reunion and immediately engaged in battle. Forced to evade the submarine assault, the crew hid the 707 in a valley. Admiral Red attempted to destroy the valley to bury the submarine under torrents of mud. Although the 707 narrowly escaped the landslide, it became trapped in a crater within a pure water layer that prevented it from surfacing. At this critical moment, the vulnerable submarine faced a barrage of numerous torpedoes.