The Poseidon-class submarine is a nuclear-powered, fast attack submarine designed by Kensington Mews Shipbuilding for the J Andres Navy. Following the Vinsalian Conflict, J Andres and New Quebec entered into an agreement to purchase warships from each other, with Irving Marine Corporation selling frigates to J Andres navy, and Kensington Mews Shipbuilding selling submarines to New Quebec.