The sea seems flooded with light on this balmy summer evening, giving the boats, rocks and waters a golden colour while seagulls swoop and dive from above. Southern Finistère looks enchanted. Its Roman name, Finis Terrae, meant “the end of the world” and this westernmost part of Brittany certainly seems like a coastal idyll. “However, this area is one of the most dangerous seabeds in Europe,” says Loïk Peton, a marine biologist standing at the top of the Phare d’Eckmühl lighthouse after clambering up 290 steps. The lighthouse is located on the headland of Penmarc’h and Peton has brought with h…