• Air-Independent Propulsion
• HVAC&R
• Military-off-the-shelf
• Custom-off-the-shelf
• HDW Class 212A
• TES
• Magnetic Anomaly Detection
• Dutch Triple Helix
• Walrus class
• Special Operation Forces
• Sophisticated Combat System
• 'Green' submarines
• Common Design
• European Submarine Family
• Stealth design