Mere days after ZAFT forces successfully landed on Carpentaria, they established the foundation of Carpentaria base and began to reinforce its position. To stop the enemy from gaining a permanent foothold on Earth, Earth Alliance dispatched the Atlantic Federation’s 21st Anti-Submarine Warfare fleet toward Australia. With the aim to stop a ZAFT naval convoy, consisting of supply submarines escorted by Vosgulov class carrier submarines, from reaching Carpentaria.
On the 10th April,the Alliance fleet’s engaged ZAFT’s submarine convoy in the Coral Sea. In the battle, the ASW Fleet deployed many Kingfisher 33SP Anti-Submarine Warfare helicopters, one of which was piloted by Ensign Jane Houston. On ZAFT's side, Marco Morassim sortied in his new GINN FEMWS, alongside GINN Wasp types
During the fighting, the Canageon and Bradford of the ASW Fleet tried to circumvent the Vosgulov-class submarines and the mobile suits to destroy the supply submarine convoy, but they were unsuccessful and were quickly destroyed.
In the end, The battle proved to be a total disaster for the Atlantic Federation; its entire 21st ASW Fleet, including the flagship Cumberland and the carrier Kingsbill, was wiped out along with all the other ships and Kingfisher helicopters, with only one survivor of the battle; the Kingfisher pilot Jane Houston.
