Related Clues:

• Lusitania's undoing
• ''Red October,'' for one
• The Nautilus, for one
• Hoagie
• Diving craft
• Sub weapon
• One may be needed after an injury
• Type of sandwich
• Not a starter
• Sonar user
• Warship
• Stand-in, for short
• U-boat, e.g.
• Footlong, e.g.
• 104-Across, for one