The following are known GameShark / Action Replay Codes for Tunnel B1 on SEGA Saturn.

• Master Code
  f6000914c305
• Infinite Energy
  16058b680320
• Infinite Lives
  16058b600320
• Infinite Boosters
  16058b6c0003
• Machine Gun Always at Single Fire
  36058BBA 0001
• Machine Gun Always at Double Fire
  36058BBA 0002
• Machine Gun Always at Triple Fire
  36058BBA 0003
• Enable 1st Primary
  36058BBF 0001
• Enable 2nd Primary
  36058BBE 0001
• Enable 3rd Primary
  36058BBD 0001
• Enable 4th Primary
  36058BBC 0001
• Enable 5th Primary
  36058BBB 0001
• Enable 1st Secondary
  36058BC0 0001
• Enable 2nd Secondary
  36058BC1 0001
• Enable 3rd Secondary
  36058BC2 0001
• Enable 4th Secondary ???
  36058BC3 0001
• Infinite Ammo 1st Secondary
  36058BB4 0063
• Infinite Ammo 2nd Secondary
  36058BB5 0063
• Infinite Ammo 3rd Secondary
  36058BB6 0063
• Infinite Ammo 4th Secondary
  36058BB7 0063
• Infinite Ammo 1st Primary
  36058BB0 0063
• Infinite Ammo 2nd Primary
  36058BB1 0063
• Infinite Ammo 3rd Primary
  36058BB2 0063
• Infinite Ammo 4th Primary
  36058BB3 0063