During a school trip on the northwestern coast of Spain, nine-year-old Noelia came across a very usual find.
"I was telling the kids to look out for bottles with their lids still on, because they might contain messages and ten seconds later, Noelia shouted 'like this one!'" José Manuel Menéndez, president of the environmental organization Senda Nova, who organized the school trip, told regional newspaper La Voz de Galicia.
The beer bottle Noelia found on Baldaio beach in A Coruña, Galicia belonged to an English-speaker called Katie, who had enclosed a note written to her friend Craig, who had died.
A teacher on the school trip who spoke English helped to translate the note, and discovered a heart-wrenching message from one friend to another.
"It has been more than a long time since I've seen you, and it still isn't easy. I miss you all the time. Your death has taught me about life and how we all ought to live," the note, written on two pages in black ink, begins.
"I'm currently in the middle of the Atlantic ocean on a sailing ship, headed towards Spain," Katie writes.
"I'm going to put this message in a bottle. A bottle of beer that I drank for you."
Screen grab: huffingtonpost.es
It seems that Katie may be from the United States, or perhaps Australia or New Zealand, as she writes that her current location heading towards Spain, is "over the other side of the world".
"I want you to know that no matter how long ago I last saw you, I will always love you, I will always miss you and I will never forget you," she writes.
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"Whilst this letter is solely for you, to let you know how much I love you and how much I still care, I hope that one day someone finds this note and some more joy and excitement is brought into the world because of you."
Little did Katie know, her note would bring excitement and joy to an entire class of nine-year-olds in Spain, none more so than Noelia, who now keeps the note as a special treasure.
Do you think you know Katie? Write to us in the comment section, on Facebook or email email@example.com to let us know!