Cheats, Secrets, Tips & Tricks

False Sinking
Press A + B to release oil and debris to the surface to falsely indicate to destroyers that your submarine has sunk. (This may only be done once per mission.)

Game Genie Codes

The following are known Game Genie Codes for Silent Service on Nintendo Entertainment System (NES).

• Start With 50 Deck Gun Shells
  ZLEPOIAI
• Start With 99 Deck Gun Shells
  LTEPOIAI
• Infinite Deck Gun Shells
  SZXVOPVG
• Infinite Bow Torpedoes
  SZSVUPVG
• Infinite Aft Torpedoes
  SXETUPVG
• Increases Max Submerged Speed From 10 To 29
  YXVPUYGP
• Increases Max Surfaced Speed From 20 To 50
  GUSOXNTO
• Infinite Battery Power
  SZSPKLVG
• Don’t Sink From Depth Charges (Your Sub Can Still Be Damaged, But You Won’t Sink)
  SXOPUGSA