From the Hans Christian Andersen biography "The Life of Hans Christian Andersen. Day By Day", written by DPhil Johan de Mylius:
7 December 1827
The story in verse "Dykker-klokken. Et Eventyr paa Havets Bund" (The Dive Bell. A Fairy-tale on The Seabed), which later appears in Fodreisen (A Walking Tour) is printed in the "Kjøbenhavns flyvende post" (The Copenhagen Flying Post).