Coral crusaders: Costa Rica’s young divers learn to protect their seas

In Puerto Viejo, scuba diving was once just for tourists, but a centre is training young people with few opportunities to care for the ocean on their doorstep

I put fresh almond leaves in your underwater masks as anti-fogging - a way to avoid using chemicals. You can remove them once in the water, just before diving," says Salim Vasquez, 14, pushing her dreadlocks away from her mask.

She distributes the equipment to her fellow divers, who are aged between 14 and 24, and Ana Maria Arenas, a group coordinator. It is 8am on a cloudy Sunday morning in Puerto Viejo, a Jamaican-inspired city in the south of Costa Rica. The young conservationists are preparing to dive into the Caribbean water for their weekly reef monitoring.