Discuss!
I say no way possible, WWI U-boats were short range and this was 2 years before WWI. The first diesel engine was fitted in a U-boat in 1912 and they were capable of short trips in the North Sea only. They were never as far west as the Titanic when she sank, not even 6 years later when WWI concluded. Also, Titanic sank in 1912, two years before WWI. No German captain would attack a ship in peacetime. He's not a kid in the backyard with a slingshot.
http://img.ibtimes.com/www/data/imag...anic-route.jpg
This map shows where Allied ships were hit during June 1915 (3 years after Titanic)
http://www.uboat.net/wwi/ships_hit/l...ring=June+1915