ur welcome for the nostalgia

The world's deepest mailbox is situated off the coast of Japan, specifically in Susami Bay. This unique mailbox can be found nearly 33 feet underwater. It was set up in 1999 with the intention of promoting Japan's historic Kumano Kodo pilgrimage trail and the picturesque areas surrounding it. This underwater post box is a remarkable and creative way to draw attention to the cultural significance of the Kumano Kodo and the natural beauty of the southern part of Wakayama's Kii Peninsula.

Fascinating fact about Susami Bay's underwater mailbox: it's not just a gimmick, but an operational post box! Divers and snorkelers can actually post waterproof cards here, and they're collected daily. Since its inception, over 32,000 pieces of mail have been sent from this deep-sea location. The mailbox itself needs frequent replacement due to the corrosive saltwater environment. Also, the idea was initially proposed by the then postmaster of Susami, Toshihiko Matsumoto, during a brainstorming session on how to revitalize the town. Such an inventive merge of culture and nature!

FCM - the breakaway