The noble pen shell (Pinna nobilis), a giant clam species native to the Mediterranean, has been nearly wiped out by a virus since 2016.

In Greece's Ambracian Gulf, marine biologist Orestis Papadakis and his team are working to save the species by monitoring larvae and relocating adult clams to safer depths. But despite the species being protected for decades, illegal fishing continues, as seen in Athens' central market. 

(This video summary was created using AI. A journalist edited it before publication.)