Iokyin yaa Submariner

A recent innovation of the Sea of Hope, the Iokyin is an oceanic vessel the Shovai claim is capable of submerging underwater, allowing its pilots to explore the depths of the sea. Theoretically, this could allow for exploration beyond the navigational borders imposed by the Sea of Smoke.
Nicknamed the Bigmouth, the Iokyin is said to hold no munitions, but the Crystal Kingdom has alleged the device has been created with the intent of conquering Greater Usor for its strategic value.