SANGO

Speed: 40 Knots/h
Sonar/Radar: 350 meters
Armament:
2 Torpedo tubes
4 Laser cannons class B
Armor: Class B
Camouflage integrated

Description:
Your main battle sub. Capable of causing a lot of damage if used properly
and i same time can take considerable amount of hits. 
Use case:
Can perform direct or flank attacks on subs. Can also be used against weak base deference. 

SHARK

Speed: 60 Knots/h
Sonar/Radar:500 meters 
Armament:
2 Torpedo tubes
2 Laser cannons class A
Armor: Classified 
Camouflage integrated