Missing submarine followed by British helicopters before it went missing

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"On Monday we were looking for an English helicopter and yesterday the Chileans. There is a lot of movement there," reads the message sent by Medina to his family's WhatsApp group.

Jessica Medina added "many" other families from missing crew members also received reports from loved ones that they had been fleeing a British helicopter around the time of their disappearance.

http://www.foxnews.com/world/2017/12/14/argentina-submarine-chased-by-british-helicopter-before-vanishing-sailors-sister-claims.html