Oldest surviving war veteran subs?

[Mush Martin]

I am able to confirm that U1 served throughout the first world war
and survived it she was sliced in half under the versailles disarmament
accords. and became a museum exhibit.

however other than those facts I have nothing on her war record a visit to
the museum website may turn it up.
MM
ps it is reported the class did not have a lucky war I have
more details on the classes war results and will pop back
with them later.