Now largely forgotten, Simon Lake once rivaled John Holland as a leader in Submarine design. But...suppose...the idea of a wheeled
 submarine had truly caught the imagination of the Admirals of the world? What would a Lake-influenced 
Deutschland or 
Surcouf have looked like? To take another tangent, take a look at Lake's last design, to be found here- ( along with all the rest of them. lake had some success designing boats for the US Navy. ) 
http://www.simonlake.com/ Remarkably similar to far more modern exploration vehicles, no?
 One last tangent- Suppose Lake's concept of diving chambers had been taken further. Whole platoons of aquatic infantry
 rising from the surf on the beaches of the unsuspecting enemy's beaches....