This maritime adventure takes us in the footsteps of a real planetary treasure… If Portugal is better known for its cultural heritage, over the course of centuries and storms, numerous shipwrecks occurred on its coasts. It is a treasure like no other, which has withstood time and climatic changes :the halieutic jewels of the crown of the Algarve. Arnaud Filleul who knows the place well, invites you to follow him on the quest for this treasure. And what better mentor could we dream of having, than this original Malouin, to guide us in the footsteps of his Corsair ancestors, in search of an authentic treasure, charged with pearl beads and silver scales from the southern coast of Portugal. About fishing, few of us know that this region is full of incredible aquatic fauna, diverse and varied, bordering its coasts throughout the year. This documentary explores an underestimated region of this country with multiple maritime colors. Ione of which the French palaeoychtologist, Arnaud Filleul is vary passionate about.