The following are known Game Genie Codes for 688 Attack Sub on SEGA Genesis.

• 6 Torpedoes (Torpex ’89 Mission)
  AALT-CNE2
  AALT-CNGR
• 6 Torpedoes (Shake ‘Em Mission)
  AALT-CNE8
  A2LT-CAGY
• 6 Torpedoes (Sub Ops Mission)
  A2LT-CAG4
• 6 Torpedoes (Mumar Cadaver Mission)
  AALT-CNFE
• 6 Torpedoes (Escape Mission)
  AALT-CNFL
  A2LT-CAHA
• 6 Torpedoes (Goulash Mission)
  AALT-CNFT
• 6 Torpedoes (Cat Walk Mission)
  AALT-CNF0
  A2LT-CAHG
• 6 Torpedoes (Surprise Party Mission)
  AALT-CNF6
  A2LT-CAHN
• 6 Torpedoes (Homecoming Mission)
  AALT-CNGC
  A2LT-CAHW
• 6 Torpedoes (Hit And Run Mission)
  AALT-CNGJ
• 32 Torpedoes (Torpex ’89 Mission)
  AALT-CAN2
  AALT-CARR
• 32 Torpedoes (Shake ‘Em Mission)
  AALT-CAN8
  EALT-CAGY
• 32 Torpedoes (Sub Ops Mission)
  EALT-CAG4
• 32 Torpedoes (Mumar Cadaver Mission)
  AALT-CAPE
• 32 Torpedoes (Escape Mission)
  AALT-CAPL
  EALT-CAHA
• 32 Torpedoes (Goulash Mission)
  AALT-CAPT
• 32 Torpedoes (Cat Walk Mission)
  AALT-CAP0
  EALT-CAHG
• 32 Torpedoes (Surprise Party Mission)
  AALT-CAP6
  EALT-CAHN
• 32 Torpedoes (Homecoming Mission)
  AALT-CARC
  EALT-CAHW
• 32 Torpedoes (Hit And Run Mission)
  AALT-CARJ
• 16 Missiles (Torpex ’89 Mission)
  A2LT-DAE6
  A2LT-DAGW
• 16 Missiles (Shake ‘Em Mission)
  A2LT-DAFC
• 16 Missiles (Mumar Cadaver Mission)
  A2LT-DAFJ
• 16 Missiles (Escape Mission)
  A2LT-DAFR
• 16 Missiles (Goulash Mission)
  A2LT-DAFY
• 16 Missiles (Cat Walk Mission)
  A2LT-DAF4
• 16 Missiles (Surprise Party Mission)
  A2LT-DAGA
• 16 Missiles (Homecoming Mission)
  A2LT-DAGG
• 16 Missiles (Hit And Run Mission)
  CALT-CAGL
• All Subs Carry 0 Torpedoes
  AALT-CAE2
  AALT-CAE6
  REHT-A6ZY
• All Subs Carry 5 Torpedoes
  AYLT-CLE2
  AALT-CAE6
  REHT-A6ZY
• All Subs Carry 5 Torpedoes, 5 Missiles And 5 Noisemakers
  AYLT-CLE2
  AYLT-CLE6
  REHTA6ZY
• All Subs Carry 10 Torpedoes, 0 Missiles And 0 Noisemakers
  BJLT-CYE2
  AALT-CAE6
  REHT-A6ZY
• All Subs Carry 10 Torpedoes, 10 Missiles And 10 Noisemakers
  BJLT-CYE2
  BJLT-CYE6
  REHT-A6ZY
• All Subs Carry 15 Torpedoes, 15 Missiles And 15 Noisemakers
  B6LT-C8E2
  B6LT-C8E6
  REHT-A6ZY
• All Subs Carry 25 Torpedoes, 25 Missiles And 25 Noisemakers
  DELT-DWE2
  DELT-DWE6
  REHT-A6ZY
• Emergency Surface Manuever Can Be Performed 2X Instead Of Only 1X
  AJHA-BT8L
  HF9T-AJGL
  AF9T-AAGN
  2THT-BGA4
• Emergency Surface Manuever Can Be Performed 4X
  ATHA-BT8L
  HF9T-AJGL
  AF9T-AAGN
  2THT-BGA4
• Emergency Surface Manuever Can Be Performed 8X
  BAHA-BT8L
  HF9T-AJGL
  AF9T-AAGN
  2THT-BGA4
• Emergency Surface Manuever Can Be Performed Infinite Times
  A39T-AA8L
• Emergency Surface Manuever Cannot Be Performed At All
  HEHT-AET4
• Towed Array May Be Redeployed After It Has Been Cut
  ACAA-AAE8
• Towed Array Already Cut (Unavailable) At Start Of Mission
  9THT-BGKA
  AAHT-B73C
  SAHT-A6VG