Snorkelling along the edge of the reef, Maratua’s sheer wall of coral disappears into the blue, a swirling mass of tropical fish dazzling me at every turn. Suddenly the turtles sense my presence and peel off the wall in synchronised..... . .

Snorkelling along the edge of the reef, Maratua’s sheer wall of coral disappears into the blue, a swirling mass of tropical fish dazzling me at every turn. Suddenly the turtles sense my presence and peel off the wall in synchronised..... . .