Postcrossing Blog

Stories about the Postcrossing community and the postal world

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We’ve written before about the Underwater Postoffice in Vanuatu, and we thought at the time it was the only place you could post a letter underwater in the world.

Well, turns out that isn’t quite true! Postcrosser Cindy (aka cindybeaule) let us know about an underwater post box in Susami, Japan, which was put in place in 1999 as part of a fair to promote the Kumano Kodo pilgrimage trail. It’s a collaboration between the former postmaster, a man called Toshihiko Matsumoto, and the local diving community. Waterproof postcards are sold in the dive shop, and you have to write your message using waterproof oil-based markers, so the message won’t wash off.

You need diving gear to even reach the post box, because it’s 10 metres below the surface. It’s actually in the Guinness Book of World Records because it’s the deepest post box in the world, and they have a certificate to prove it! The boxes are made of cast-iron, so there are actually two used in rotation, so they can be cleaned and repainted.

I even did some more poking around, and it turns out there are a few other underwater post boxes. There’s one in the Malaysian island of Mataking, another one in the Jemeluk Bay Underwater Gallery in Indonesia, and two “dry” ones: an underwater observatory in the US Virgin Islands and the Risør Underwater Post Office in Norway.

You can watch a whole mini-documentary about the post box in Susami on Youtube—we were amazed to learn that there had been over 38,000 special waterproof postcards sent from this underwater post box at the time it was filmed in 2018. I wonder if any Postcrossers have ever sent or received a card from Susami…? Do let us know!


Ever wondered if there is a way to speed up the delivery of the mail sent to you? Well, actually there is!

It’s quite an obvious fact, but is many times overlooked: writing your address in the most complete and correct way for your country helps a good deal on the speed of the delivery. However, each country has it’s own guidelines of how to write the address so, to help with this, the Universal Postal Union (UPU) has created guides for each country describing how to correctly write the address in that country. This not only insures that the mail is always delivered to you but also that it is done as fast as possible when all the mail is sorted and distributed on the postal services.

To help you find the guide for your own country you can go to your edit address section where you’ll find a direct link to it, or go to the UPU website for all the guides.

Oh, and also very important: if your country has a postal code system (most do), make sure you have your postal code in your address and that it is complete. That will also help the postcards arrive faster to you!

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