Dive Gear

The Dive Gear was a concept developed by a Koan Artificer named Silence, who defected from the empire after realizing the harm it could cause. It is a ship fixture that can be used to temporarily submerge a regular ship underwater like a submarine.
After Silence's death, Anh Edonia completed development of the dive gear and used it to sink the first Koan Dreadnaught. During the battle, the dive gear allowed The Dark Home to sink below the waves and avoid fire from the dreadnaught's cannons.