ARA San Juan has been located in the north atlantic by the French Navy.

The submarine was reportedly found hunting civilian ships, after the french frigate La Fayette discovered an abandonned cargo ship with no survivors onboard and a strange form of slimish material on the deck.

The french ship then found the ARA San Juan, which reportedly identified as " The Flying Whiteman ", and managed to flee the area to avoid the faith of the civilian ship they discovered.

The helicopter crew of the FS La Fayette managed to snap a picture of the San Juan while leaving the area.
Pic related it's it