Mårtensson was thrilled his letter had found its way to a recipient, but he was in his late 20s. "I'm not the ideal pen pal for a 15-year-old," he thought. But he had an idea: he'd introduce this young letter writer to his wife's sister, Saija Kuparinen.
Kuparinen, 14, lived in Finland. She'd had no idea her brother-in-law had thrown a bottle off a ship near the Equator, but upon hearing the story she was eager to write to the boy in Liberia.
Kuparinen wasn't confident writing in English, so she composed a message in German, writing about her school, friends, family and life in Finland.
She hoped she'd get a response, but her letter travelling across the world felt like a longshot. But it wasn't. Beever got her letter and was delighted. He loved the idea of communicating with a girl in Finland.
He scrawled a response, and a connection was formed. Five decades later, the pair are still in touch, not only pen pals but close friends who've watched each other grow up from afar.
[Read more]