Submarine

Level ID Requires Allows Name / Effects
1 5000 Basic Submarine Construction
5001 Nautical Gyrocompass
5002 Improved Pressure Hull
5003 Steel Periscope
5004 Adequate Night Sights
5005 5001 6605 Medium Range Submarine (Sub Model II)
5002 6715 type = new_model which = submarine value = 1
5003
5004
2 5100

5000
5101 Basic Conventional Torpedo
5102 Small Underwater Vehicle Testing
5103 5102 Basic Minisubs
type = minisub_bonus value = 1
3 5200

5100

 Equipment Trials and Testing
5201 5005 Closed Circle Engine Trials and Testing
5202 5101 Torpedo Correction Trials and Testing
type = naval_attack which = submarine when = now value = 1
5203 5002 Streamlined Pressure Hulls Testing
5204 5003 Schnorkel Testing
4 5300

5200

 Improved Weaponry and Detection
5301 3003 Torpedo Data Computer
3102 type = naval_attack which = submarine when = on_upgrade value = 2
3103
5302 5202 Improved Conventional Torpedo
type = naval_attack which = submarine when = now value = 1
5303 3003 Basic Submarine Sonar
type = surface_detection which = submarine when = on_upgrade value = 1
type = sub_detection which = submarine when = on_upgrade value = 2
5304 3206 Long Range Radio Communication
type = surface_detection which = submarine when = now value = 1
5 5400

5300

 Improved Submarine Construction
5401 Large Fuel Tank Design
5402 Advanced Torpedo Chambers
5403 5203 Advanced Pressure Hull
5404 5204 Basic Schnorkel
5405 5004 Excellent Night Sights
5406 5005 Long Range Submarine (Sub Model II)
5401 type = new_model which = submarine value = 2
5402
5403
5404
5405
6 5500

5400

 Long Range Naval Recon Aircraft
5501 Submarine - Naval Aviation Cooperative Routine
5502 5501 Basic LR Naval Recon Aircraft
9106 type = surface_detection which = submarine when = now value = 0.5
5503 5502 LR Naval Fighter-Bomber Aircraft
10507 type = surface_detection which = submarine when = now value = 0.5
type = naval_attack which = submarine when = now value = 1
5504 5502 Improved LR Naval Recon Aircraft
9506 type = surface_detection which = submarine when = now value = 1
5505 5502 VLR Naval Recon Aircraft
9508 type = surface_detection which = submarine when = now value = 2
7 5600

5500

 Advanced Weaponry and Detection
5601 3504 Basic Acoustic Torpedo
5302 type = naval_attack which = submarine when = now value = 1
5402
5602 5301 Basic Torpedo-pattern Apparatus
5302 type = naval_attack which = submarine when = on_upgrade value = 1
5603 5302 Advanced Conventional Torpedo
type = naval_attack which = submarine when = now value = 1
5604 3503 Basic Radar Warning System
type = air_detection which = submarine when = on_upgrade value = 2
5605 5103 Improved Minisubs
5203 type = minisub_bonus value = 2
8 5700

5600

 Advanced Submarine Construction
5701 5201 Closed Circle Engine
7202
5702 4204 Air Condition and Cooling System
5703 5403 Streamlined Pressure Hull
5704 5404 Improved Schnorkel
5705 5402 Hydralic Reload System
5706 5406 Electro Submarine (Sub Model III)
5701 type = new_model which = submarine value = 3
5702
5703
5704
5705
5707 3704 Improved Radar Warning System
5604 type = air_detection which = submarine when = on_upgrade value = 1
9 5800

5700

 Refined Equipment and Countermeasures
5801 3705 Improved Acoustic Torpedo
5601 type = naval_attack which = submarine when = now value = 1
5802 5602 Improved Torpedo-pattern Apparatus
type = naval_attack which = submarine when = on_upgrade value = 1
5803 5707 Advanced Radar Warning System
type = air_detection which = submarine when = on_upgrade value = 2
5804 4204 Basic Anti-Radar Rubber Coating
type = naval_defense which = submarine when = on_upgrade value = 2
type = visibility which = submarine when = on_upgrade value = -1
10 5900

5800

 Special Vehicles and Detection Systems
5901 3702 Improved Submarine Sonar
5303 type = surface_detection which = submarine when = on_upgrade value = 1
type = sub_detection which = submarine when = on_upgrade value = 2
5902 3903 Semi-Modern Radar Warning System
5803 type = air_detection which = submarine when = on_upgrade value = 1
5903 5403 Advanced Minisubs
5605 type = minisub_bonus value = 3
5703
11 5940

5900

 Modern Equipment and Countermeasures
5941 4204 Improved Anti-Radar Rubber Coating
5804 type = naval_defense which = submarine when = on_upgrade value = 2
type = visibility which = submarine when = on_upgrade value = -1
5942 3904 Advanced Acoustic Torpedo
5801 type = naval_attack which = submarine when = now value = 1
5943 5706 Single Propeller Silent Engine
type = naval_defense which = submarine when = now value = 2
type = visibility which = submarine when = on_upgrade value = -1
12 5970

5940

 Nuclear Submarine
5971 8701 Emergency Shut-down System
8702
8703
8704
5972 5971 Nuclear powered Submarine (Sub Model IV)
8971 type = new_model which = submarine value = 4

Notes
Level is the technology level.
ID is the level / application ID.
Requires states any prior research that must have been done prior to researching a given
technology. Note, the base level technology must always be researched prior to researching any
application within that level.
Allows means this technology is required for the listed technologies.
Name is the name used in game. Really, it's from the comment in the tech file.
Effects are adjustments put into effect when a technology is researched.
The source file for this information is ..\DB\Tech\submarine_tech.txt

Technology Path Changes
These branch into other technology trees and continue in this tree.
5005 Medium Range Submarine (Sub Model II)

These branch into another technology tree and end in this tree.
None

These end a technology path.
5304 Long Range Radio Communication
5503 LR Naval Fighter-Bomber Aircraft
5504 Improved LR Naval Recon Aircraft
5505 VLR Naval Recon Aircraft
5603 Advanced Conventional Torpedo
5802 Improved Torpedo-pattern Apparatus
5804 Basic Anti-Radar Rubber Coating
5901 Improved Submarine Sonar
5902 Semi-Modern Radar Warning System
5903 Advanced Minisubs
5941 Improved Anti-Radar Rubber Coating
5942 Advanced Acoustic Torpedo
5943 Single Propeller Silent Engine
5972 Nuclear powered Submarine (Sub Model IV)

 

By State Machine as of 1.04
(23 January Beta Patch)