The mystery surrounding their reproduction makes eels not only one of the oldest species, but also one of nature's strangest creatures. The adult fish migrate to the open sea, spawn after a 6,000-km journey somewhere southeast of Bermuda in the Atlantic and then die. The young larvae drift back to Europe with the ocean currents and arrive at the coast as glass eels. Those larvae are caught and used in farms. But finding the eggs, let alone breeding them in captivity, has never been done. With the eel facing extinction, the search for the mystery of its reproduction takes on a new urgency.