After hearing this story all of my life I began to realize that there was no way it could be a U-Boat. And so I researched.
This photo is what is left of this vessel today.

The next photo is of my father standing on the same vessel in 1949.
Notice the angle of the deck and the angle of the remains in the top photo.

Now I believe that the identity of the vessel is a torpedo boat, the USS Stringham TB-19. Unfortunately I have not been able to confirm this but I am 99% sure that she is the Stringham.
This photo is of a Spanish American War era torpedo boat under construction. It looks quite simular to what my father is standing on.
