The Slug Sub is an underwater vehicle used by the Regular Army.
The Slug Sub is a small submarine used during the Second Mission. Unlike other slugs, it doesn't have a Vulcan equipped on it, rather relying on torpedoes. When it's resurfaced, the Slug Sub can fire homing rockets, which get replaced for depth charges when it submerges.
- The Slug Sub was most likely based on the Granvia from In The Hunt, as both submarines play very similarly.
|Mechanized||SV-001 (Metal Slug) | SV-001 Type-R | Slug Copter | Slug Flyer | Slug Sub | Astro Slug | Slug Gunner | Slugnoid | LV Armor | Walking Machine | Slug Mariner | Drill Slug | M-15A Bradley | Metal Claw | Forklift | Slug Mobile | Augensterm | Protogunner | Slug Digger | Slug Trolley | Slug Armor | Slug Gigant | Golden Slug | MS-Alice | Ball Slug | Slug Square|
|Animal||SV-Camel | Elephant Slug | Ostrich Slug | Donkey Slug|
|Other||Middle-Son 1986 | Middle-Son 1999 | SV-002 | Borobune Slug | Motorcycle | Parachute Drop | Drop Pack | Regular Army Helicopter | Landseek | PA33-21 Boat | RA-TTT | Rootmars|