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Ha-100 Midget Submarine (OTL Type D; stats based on google translation of the Japanese wiki page)
Boats: Ha-100, Ha-101, Ha-102, Ha-103, Ha-104, Ha-105, Ha-106, Ha-107.
Year: 1946
Length: 26.25 m.
Beam: 2.04 m.
Draft: 3.81 m.
Displacement (full): 60 tons.
Machinery: 600 hp electric motors, 150 hp diesel engine.
Speed: (surface) 8 knots, (submerged) 16-18 knots.
Range: (surface) 1,000nm at 8 knots, (submerged) 125nm at 2.5 knots, 10.5 at 16 knots.
Depth: 100 m.
Armament: 2 muzzle-loaded 45cm torpedoes.
Crew: 5.

I-402 Japanese Submarine
Date: 1946
Type: Oceanic
Length: 130.00m
Beam: 13.50m
Draft: 10.48m
Crush depth: 317.5m
Light Displacement 5493t
Loaded Displacement 8257t
Full Displacement 9196t
wt fuel&batts: 4050t
Reserve buoyancy: 10%
Armament:
- 8 x 533mm (bow)
- 3x3 + 4x2 25mm MGs (1 from sim, 16 from misc weights)
- 64 tons for mines or reload torpedoes
ElecHP: 24800hp
DieselHP: 12000hp
Speed:
- Max Surf Speed: 16.1 knots
- Max Sub Speed: 19.9 knots
Range:
- Surfaced: 32,469nm@12 knots
- Submerged: 567nm@5 knots
Tons Oil: 2700.0t
Tons Battery: 1350.0t
Miscellaneous Weight: 800 tons
Crew: 164


- 38 Type 3 torpedoes (= 8 in the tubes + 32 from the 64 tons for 'mines or reload torpedoes', 16 in the upper room and 16 in the lower room), 4 idle positions to permit withdrawal of torpedoes from tubes for servicing (8 tons miscellaneous).
- Diesel-electric drive.
- Main electric engines output: 24,000 shp.
- Silent running engines output: 800 shp.
- Surface speed: (diesel-electric) 16.1 knots, (battery-electric) 20.6 knots.
- Submerged speed: (silent running engines) 6.3 knots, (battery-electric) 19.7 knots, (diesel-electric + Ninjatousaya) 9.9 knots.
- Range Surfaced (diesel-Electric): 57,723nm@9 knots, 46,756nm@10 knots, 32,469nm@12 knots, 20,780nm@15 knots.
- Range Submerged (batteries, silent running engines): 1,615nm@3 knots, 567nm@5 knots, 346nm@6.3 knots.
- Range Submerged (batteries, main engines): 202nm@8 knots, 116nm@10 knots, 34nm@15 knots.
- Range Submerged (diesel-electric + Ninjatousaya): 57,150nm@6 knots, 32,080nm@8 knots, 20,350@10 knots
- Endurance: (surfaced) 194 days and 19 hour @ 10 knots, (submerged, batteries) 4 days and 17 hours @ 5 knots
- Diving depth: 417 feet
- Emergency Depth: 667 feet
- Crush Depth: 1042 feet


- 800 tons Miscellaneous weights breakdown:
--- 30 tons for secondary CT starboard to counter the underwater drag effects of the main CT offset to port
--- 75 tons for 3 aircraft or 10 MXY7B
--- 20 tons for catapult and crane
--- 10 tons for rocket launch rail fitted over the catapult.
--- 30 tons for electric torpedo reloading system
--- 5 tons for torpedo service material
--- 8 tons for 4 idle torpedo positions in the torpedo rooms (2 upper, 2 lower) for torpedo servicing
--- 16 ton for 16 extra 25mm machineguns
--- 10 tons for Ninjatousaya System
--- 100 tons for 2x sonar, hydrophones, air search radar, air/surface radar and radar warning receiver
--- 70 tons for defense countermeasures and 'camouflage'
--- 55 tons for air condition system
--- 10 tons for 200 oxygen bottles (50 l, 150 atm, about 353 hours of oxygen total).
--- 10 tons for CO2 removal system + Soda lime
--- 55 tons for damage control and fire suppression systems
--- 20 tons for demagnetization cables
--- 15 tons for safety and rescue equipment
--- 15 tons for yatai mobile food stall (well, mobile since the sub moves around)
--- 20 tons for pachinko parlor
--- 15 tons for karaoke facilities + Kobe Cola vending machines
--- 20 tons for officer's lounge
--- 10 tons for deep freeze unit
--- 5 tons for desalinization gear
--- 150 tons for extra stores for long range patrols
--- 26 tons for crew comforts (toilets, showers, board games, puzzles, playing cards, dice games, etc.)

I-314 Submarine
Experimental submarine along the lines of the French Gymnote class and Italian V-Class. The I-314 is equipped with a H2O2 propulsion system using a high-concentration solution of hydrogen peroxide.

Date: 1947
Type: Coastal
Length: 56.0m
Beam: 5.0m
Draft: 5.5m
Crush depth: 225.0m
Light Displacement 571t
Loaded Displacement 692t
Full Displacement 770t
wt fuel&batts: 115t
Reserve buoyancy: 10%

Armament:
- 4 x 533mm (bow)
- 16 tons for mines or reload torpedoes
ElecHP: 80hp
DieselHP: 500hp
H2O2HP: 9500hp
Speed:
- Max Surf Speed: 10.2 knots
- Max Sub Speed: 25.6 knots
Range:
- Surfaced: 3,564nm@10 knots
- Submerged: 3,198nm@5 knots
Tons Oil: 40.0t
Tons Battery: 10.0t
Tons H2O2: 65.0t
Miscellaneous Weight: 110 tons

Crew: 34

- 12 Type 3 torpedoes (= 4 in the tubes + 8 from the 16 tons for 'mines or reload torpedoes')
- Diesel + H2O2 drive + silent running electric engine.
- Surface speed: (diesel) 10.2 knots, (H2O2) 26.3 knots.
- Submerged speed: (silent running engines) 5.1 knots, (H2O2) 25.5 knots, (diesel + Ninjatousaya) 9.5 knots.
- Range Surfaced (diesel): 4,400nm@9 knots, 3,564nm@10 knots.
- Range Submerged (silent running engines): 134nm@2 knots, 53nm@3 knots, 12nm@5 knots.
- Range Submerged (H2O2): 3,186nm@5 knots, 1,245nm@8 knots, 796nm@10 knots, 354nm@15 knots, 127nm@25 knots.
- Range Submerged (diesel + Ninjatousaya): 4,050nm@6 knots, 2,120nm@8 knots, 1,300@9.5 knots.
- Endurance: (surfaced, diesel) 14 days and 20 hours @ 10 knots, (submerged, H2O2) 26 days and 13 hours @ 5 knots.
- Diving depth: 295 feet
- Emergency Depth: 472 feet
- Crush Depth: 738 feet
- 110 tons Miscellaneous weights breakdown:
--- 10 tons for Ninjatousaya System
--- 30 tons for sonar and hydrophones
--- 10 tons for air condition system
--- 2 tons for 40 oxygen bottles (50 l, 150 atm, about 341 hours of oxygen total)
--- 5 tons CO2 removal system + Soda lime
--- 40 tons for damage control and fire suppression systems
--- 6 tons for demagnetization cables
--- 2 tons for deep freeze unit
--- 5 tons for desalinization gear

I-315 Submarine

Continuation of the evolution of the I-305 design. The I-315 class is bigger and more powerful than the I-310 class, being similar in size to the I-400 and I-402 classes. The I-315 was designed for the purpose of attacking and sinking other submarines, surface combatants and merchant vessels and it is the first patrol submarine of the Imperial Japanese Navy that does not carry any kind of defensive or offensive guns, relying solely on the deadly Type 3 torpedoes and the ability to remain submerged for long periods of time.

Date: 1947
Type: Oceanic
Length: 130.0m
Beam: 11.2m
Draft: 12.0m
Crush depth: 317.5m
Light Displacement 6591t
Loaded Displacement 7896t
Full Displacement 8736t
wt fuel&batts: 3050t
Reserve buoyancy: 10%

Armament:
- 8 x 533mm (bow)
- 80 tons for mines or reload torpedoes
ElecHP: 36000hp
DieselHP: 11500hp
Speed:
- Max Surf Speed: 16.1 knots
- Max Sub Speed: 22.8 knots
Range:
- Surfaced: 22,311nm@10 knots
- Submerged: 800nm@5 knots
Tons Oil: 1225.0t
Tons Battery: 1825.0t
Miscellaneous Weight: 700 tons

Crew: 193

- 48 Type 3 torpedoes (= 8 in the tubes + 40 from the 80 tons for 'mines or reload torpedoes', 20 in the upper room and 20 in the lower room), 8 idle positions to permit withdrawal of torpedoes from tubes for servicing (16 tons miscellaneous).
- Diesel-electric drive.
- Main electric engines output: 35,000 shp.
- Silent running engines output: 1,000 shp.
- Surface speed: (diesel-electric) 16.1 knots, (battery-electric) 23.4 knots.
- Submerged speed: (silent running engines) 6.9 knots, (battery-electric) 22.6 knots, (diesel-electric + Ninjatousaya) 12 knots.
- Range Surfaced (diesel-Electric): 27,569nm@9 knots, 22,331nm@10 knots, 15,570nm@12 knots, 9,925nm@15 knots.
- Range Submerged (batteries, silent running engines): 2,264nm@3 knots, 800nm@5 knots, 547nm@6 knots.
- Range Submerged (batteries, main engines): 292nm@8 knots, 172nm@10 knots, 56nm@15 knots.
- Range Submerged (diesel-electric + Ninjatousaya): 27,150nm@6 knots, 15,050nm@8 knots, 9,450@10 knots, 8,400nm@12 knots.
- Endurance: (surfaced, diesel) 92 days and 23 hours @ 10 knots, (submerged, batteries) 6 days and 16 hours @ 5 knots.
- Diving depth: 417 feet
- Emergency Depth: 667 feet
- Crush Depth: 1042 feet
- 700 tons Miscellaneous weights breakdown:
--- 30 tons for electric torpedo reloading system.
--- 20 tons for air-powered piston ejection pumps.
--- 5 tons for torpedo service material.
--- 16 tons for 8 idle torpedo positions in the torpedo rooms (4 upper, 4 lower) for torpedo servicing.
--- 10 tons for Ninjatousaya System.
--- 120 tons for sonar+ system, hydrophones, air search radar, air/surface radar and radar warning receiver.
--- 185 tons for defense countermeasures, 'camouflage' and sound-isolation.
--- 66 tons for air condition system.
--- 30 tons for 600 oxygen bottles (50 l, 150 atm, about 901 hours of oxygen total).
--- 10 tons for CO2 removal system + Soda lime.
--- 66 tons for damage control and fire suppression systems.
--- 20 tons for demagnetization cables.
--- 15 tons for safety and rescue equipment.
--- 15 tons for yatai mobile food stall.
--- 20 tons for pachinko parlor.
--- 15 tons for karaoke facilities + Kobe Cola vending machines.
--- 20 tons for officer's lounge.
--- 10 tons for deep freeze unit.
--- 5 tons for desalinization gear.
--- 12 tons for crew comforts (toilets, showers, board games, puzzles, playing cards, dice games, etc.)
--- 10 tons for improved control surfaces.

I-350

Date: 1948
Type: Coastal
Length: 40.0m
Beam: 4.5m
Draft: 4.5m
Crush depth: 225.0m
Light Displacement 335t
Loaded Displacement 363t
Full Displacement 405t
wt fuel&batts: 60t
Reserve buoyancy: 10%

Armament:
- 2 x 21" (bow)
ElecHP: 1650hp
DieselHP: 225hp
Speed:
- Max Surf Speed: 8.2 knots
- Max Sub Speed: 16.2 knots
Range:
- Surfaced: 3,781nm@8 knots
- Submerged: 122nm@5 knots
Tons Oil: 20.0t
Tons Battery: 40.0t
Miscellaneous Weight: 50 tons

Crew: 18

- 6 Type 3 torpedoes (= 2 in the tubes + 4 from the 8 tons for 'mines or reload torpedoes').
- Diesel-electric drive.
- Main electric engine output: 1,550 shp.
- Silent running engine output: 100 shp.
- Surface speed: (diesel-electric) 16.1 knots.
- Submerged speed: (silent running engines) 6.3 knots, (battery-electric) 15.8 knots, (diesel-electric + Ninjatousaya) 10 knots.
- Range Surfaced (diesel): 3,781nm@8 knots.
- Range Submerged (batteries, silent running engine): 862nm@2 knots, 375nm@3 knots, 122nm@5 knots.
- Range Submerged (batteries, main engine): 35nm@8 knots, 17nm@10 knots, 3nm@15 knots.
- Endurance: (surfaced, diesel) 19 days and 16 hours @ 8 knots, (submerged, electric) 1 day @ 5 knots.
- Diving depth: 295 feet
- Emergency Depth: 472 feet
- Crush Depth: 738 feet
- 50 tons Miscellaneous weights breakdown:
--- 10 tons for Ninjatousaya System.
--- 20 tons for sonar and hydrophones.
--- 10 tons for air condition system.
--- 1 tons for 20 oxygen bottles (50 l, 150 atm).
--- 5 tons CO2 removal system + Soda lime.
--- 4 tons for desalinization gear.

IN-1 class, Japan Submarine for crazy ninjas
Date: 1948
Type: Coastal
Length: 65.0m
Beam: 6.0m
Draft: 6.3m
Crush depth: 225.0m
Light Displacement 915t
Loaded Displacement 1090t
Full Displacement 1219t
wt fuel&batts: 190t
Reserve buoyancy: 11%

Armament:
- 2 x man-sized (bow)
- 0 tons for mines or reload torpedoes
ElecHP: 150hp
DieselHP: 4500hp
H2O2HP: 10000hp
Speed:
- Max Surf Speed: 18.0 knots
- Max Sub Speed: 23.2 knots
Range:
- Surfaced: 4,900nm@10 knots
- Submerged: 3,623nm@5 knots
Tons Oil: 75.0t
Tons Battery: 15.0t
Tons H2O2: 100.0t
Miscellaneous Weight: 205 tons
Crew: 54

205 tons for schnorkel, electronics and a bunch of ninjas squeezed into every nook and cranny aboard the submarine.