Time for a submarine:
The HSY-70 submarine or Amphitrite Class was designed in 1970's with some french assistance based loosely on the Rubis hull but with diesel electric propulsion instead of nuclear and several features of Agosta submarines. So, its appearance is that of a fatter and longer Agosta. They featured french sonar systems, six 550 mm torpedo tubes with pneumatic automatic reload system (shared with Agosta), 24 weapons capacity - torpedoes and Sub-Turbo Exocet missiles - integrated to a domestic designed fire control system.
The HSY-70 has also the maximum possible battery capacity for its size and twin electric motors -one small cruising long range motor and a large powerful motor for higher speed- following again french practice. Also she was specially designed for being very quiet and very difficult to detect, especially in low speed. Drawing is the early HSY-70, later built had more hydrodynamic bow and several improvements.
Displacement (tn): 2060/2570
Dimensions (m): 72.6 x 7.6 x 6.4
Machinery : 2 x ADC/GM 12-630SD diesels, 2,400 hp each, 2 electric motors (one 64 hp and one 8,500 hp)
Speed : Low speed 4 kn, max speed officially classified but said to be ~22.5 kn for the early hull and ~24 kn for the later hull
Armament : 6 x 550mm torpedo tubes, 24 weapons (usually 18 torpedoes and 6 missiles) or 48 mines
Electronics (early): DSUV-22, DUUA-2B, DUUX-5, DSUV-62 towed array sonars, domestic unspecified radar and ECM
Depth : 300m operational, test depth ~500m