The Homeric adventure of Switzerland’s most iconic submersible. A revolutionary project in its day, still unsurpassed today. An improbable odyssey across several oceans. The quest for an enormous treasure. An investigation that traces over 60 years of history. A long and difficult plunge into the archives, punctuated by inconsistencies that obscure already complex research. Documents that haven’t been looked at in decades. Conflicting sources indicate dates and itineraries that don’t match. Forgotten information resurfaces, and astonishing photographs and videos, some never before seen, finally come to light. As the investigation progresses, the fog thickens and forms a nebula that adds to the mystery of this ship that has become a legend.