Mere days after ZAFT forces successfully landed on Carpentaria and destroyed invading Alliance forces, they established the core of Carpentaria base, and began to reinforce their position by orbital dropping prefabricated base structure and even entire submarines down to Earth, securing their logistical route.
To stop ZAFT from gaining a permanent foothold on Earth, Earth Alliance dispatched the Atlantic Federation’s 21st Anti-Submarine Warfare fleet toward Australia. The aim is to stop a ZAFT naval convoy, consisting of supply submarines escorted by Vosgulov class carrier submarines, from reaching Carpentaria. The convoy landed in Tasman sea, and will travel through Coral sea and Torres Strait to reach their destination Carpentaria base.

On the 10th April,the Alliance fleet’s engaged ZAFT’s submarine convoy in the Coral Sea before they could enter Torres strait. 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 the new Ginn FEMWS, alongside Ginn WASP.


During the fighting, Alliance guided missile destroyers Canageon and Bradford tried to circumvent the ZAFT submarine carriers and MS 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.