Returning to the Maldives for the first time in 25 years, Weinberg is carrying out research for an update of his Red Sea & Indian Ocean field guide, and will be sharing his marine-life knowledge as well as underwater photography skills with guests.

Carpe Diem says that enthusiasm is valued over experience and you don’t need a scientific background to take part in its Dive with a Purpose trips.

Up to 20 recreational divers can join each of the seven-night trips for US $1863pp, including 3-4 dives most days, transfers and evening workshops on marine ecology, coral reef, marine life and photography.

The cruises start on 15 and 22 July.