Original NES Game Genie codes created by: Tony Hedstrom t_hedstrom@yahoo.com http://www.angelfire.com/games2/codehut/ Silent Service YXVPUYGP Increases max submerged speed from 10 to 29. PUVPUYGP Increases max submerged speed from 10 to 39. GUSOXNTO Increases max surfaced speed from 20 to 50. SZSPKLVG Infinite battery power. SXOPUGSA Don't sink from depth charges (your sub can still be damaged, but you won't sink).