 During the torpedo attack, the crew said they felt an impact which was believed to have been one of the three torpedoes fired from .They later found four cracks in the hull which were thought to have been related to a dud torpedo impact or near miss explosion.On the night of 17/18 May a helicopter was tracked by the radar of "Bouchard", who sent a message to her sister ship ARA "Piedrabuena", patrolling on the north, and then to the naval base of Río Grande.