19m (63ft) unter sea level – probably the deepest mailbox in the world. The diving center Kreidesee offers to send postcards, which can be sent from this mailbox. For this purpose, waterproof postcards can be purchased in the diving center. The mailbox is emptied weekly and the cards are stamped and sent.

Build your own ‘Rüttler’ model

Download the STL-Files for printing here: Ruettler – 19,95 EUR