In Susami, a small fishing town in Japan once overlooked by tourists, a 70-year-old postmaster's imaginative idea created a unique underwater mailbox that now draws thousands of diving visitors every year.
- Mailbox is anchored 10 meters underwater in Susami Bay
- Uses waterproof postcards and oil-based markers
- Winner of Guinness World Record for deepest underwater mailbox
What happened
Susami, a quiet fishing town in Wakayama Prefecture, Japan, faced dwindling tourist traffic by the late 1990s. Recognizing the challenge, postmaster Toshihiko Matsumoto envisioned an unusual attraction: a working mailbox placed 30 feet (10 meters) beneath the sea’s surface. This creative idea aimed to offer divers a new way to send mail while simultaneously promoting the town’s appeal.
To make this vision practical, Matsumoto organized the use of specialized waterproof postcards and markers that wouldn’t dissolve or smear underwater. The mailbox itself, made of cast iron and bright red for visibility, was anchored securely to the seabed and officially linked to Susami’s local post office. Today, divers write messages underwater, drop them into the mailbox, and those letters are then collected daily and sent worldwide.
Why it feels good
This underwater mailbox represents more than just a quirky novelty; it embodies a thoughtful and engaging solution to economic struggles faced by a small community. By creatively leveraging local resources and unique experiences, Matsumoto helped revive Susami’s tourism in a way that encourages exploration and adventure.
Moreover, the initiative encourages connection between people globally through the simple act of mailing a letter—yet with an underwater twist. It’s a heartwarming example of how thoughtful innovation can enrich community life while celebrating the natural environment. Its recognition by Guinness World Records and its feature in media and commercials further amplify this goodwill.
What to enjoy or watch next
Visitors to Susami can explore dive shops like Club Noah Susami, where waterproof postcards and oil-based markers are sold. Beginners can even join guided beach diving lessons to experience mailing letters underwater themselves. For those who can’t visit in person, the popular video by Great Big Story showcasing the mailbox has surpassed a million views and offers a glimpse into this extraordinary underwater mail delivery.
Looking ahead, Susami’s innovative approach may inspire other communities to pursue creative local projects. For those fascinated by unique postal stories or offbeat tourism, exploring similar ventures or watching documentaries about small-town ingenuity can be rewarding ways to stay connected to uplifting real-world creativity.