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The world’s deepest underwater mailbox is in Susami, Japan, 33 meters below the surface. Divers can purchase waterproof postcards and write messages with oil-based markers. Approximately 1,500 letters are delivered each year, and the mailbox is made from non-polluting metal to prevent damage to coral reefs. The idea was proposed by the postmaster in 1999 as an attraction for diving enthusiasts.
Next time you’re on vacation, don’t forget to send home some postcards. If you happen to visit the Japanese fishing town of Susami and enjoy diving, you can use the deepest underwater mailbox in the world, which is submerged about 33 meters below the surface of the bay. The mailbox is used by divers who purchase waterproof postcards at a nearby dive shop and write messages with oil-based markers. A shop employee regularly dives for postcards and takes them to the post office.
I wish you were here:
Approximately 1,500 letters are delivered to the mailbox each year. It is made from a non-polluting metal and placed in a sandy bottom to prevent damage to the coral reefs.
Susami has no particular attractions, so Toshihiko Matsumoto, who was the postmaster of the city in 1999, proposed the idea as an attraction for diving enthusiasts.
Seawater regularly corrodes the cast iron box, so there is a backup that is cleaned and repainted every six months.
