|Dimensions|| Length: 36 meters,
Weight: 95 tons
|Performance||Critical submergence depth: 3000 meters|
The Ultra Submarine has a seat for the Grendizer to sit on and pilot. It also has a cockpit for humans to ride in and pilot. It is able to dive to a certain depth and support the Grendizer with weaponry to battle enemies underwater.
- Submarine Missile: Basic torpedo attack shot from openings in the nose.
- Submarine Drill: A large drill that protrudes from an opening in front, used for ramming.
- Submarine Storm: A jet of high pressured water that would fire from the same opening as the Submarine Drill.
- Chain Attack: Four chains that were fired from four openings below the Submarine Missile opening.