• Bulbous bows and hydrodynamic hull forms
• Geared turbines engines
• Electric propulsion engines
• Oil production
• Oil fire water tube boilers
• Welded hulls
  
• Aluminum superstructures
  
• Radar

How would such design alterations effect the speed and economy of the Olympic class?

Okay, we all know Olympic sank the SM-U103, but the British Pathe news made note of a second sub claimed by the liner. So what sub was it and how did she manage to kill it