This event happened on September 22, 1970:

Ninety-five miles from the Port of Ocoña





Four surface units (destroyers) and three submarines of the Peruvian Navy carry out naval exercises







Suddenly a surface unit, the B.A.P. Villar, detects the presence of an intruding submarine.
Not far from there the chilean oil tanker Almirante Montt [possibly] provided close support to the submarine







Destroyers of the Peruvian Navy attack the intruding submarine.
With the attack the spy submarine suffers damage to its sail







After the attack it is detected that the spy submarine manages to flee wounded.
Intelligence of the Peruvian Navy obtains information that said submarine was of Chilean nationality: The Thomson SS-20





CREDITS:
  1. The drawings of the four destroyers and three Peruvian submarines as well as the drawings of the chilean oil tanker and submarine were taken from http://www.shipbucket.com
  2. The background was taken from https://electronica-submarina.es
  3. The flags of Peru and Chile were taken from https://es.wikipedia.org
  4. All sonar waves are self-created
  5. The adaptation of the text and the graphic sequence within the maritime scenario are self-created

Iván Illanes Mendoza