For deep reef divers, descending into the ocean’s mesophotic layer can feel like exploring the moon. Discovering never-before-seen marine species is part of the mission.

Turks & Caicos may be famed for its luxurious resorts, but its truest treasures lie in the reefs, caves and secluded coves. It’s a beautiful, delicate ecosystem and every visitor has a role to play in ...

This article was produced by National Geographic Traveller (UK). The first time a giant trevally fish hits me on the forehead, I freeze. We’re 39ft below the surface of the ocean at dusk, the inky ...