Beachcombers in Morocco hunt for hidden treasure

Agadir, Morocco – Mustapha Harmouch moves slowly across the sand at Agadir’s Corniche, sweeping his metal detector in low, even arcs. He tunes out the surfers paddling beyond the shore, the children shrieking in the waves and the chatter of families, all his attention is on one sound: the beep that means the coil has passed over something buried beneath the sand.

For the 33-year...