Teeming with images of spectacular underwater scenes from around the world, Call of the Blue is the culmination of a five-year project by the photographer and ocean conservationist Philip Hamilton. This groundbreaking book includes contributions from acclaimed scientists and ocean “guardians”, who reveal what drove them to answer the call of the blue. (Photo by Philip Hamilton/The Guardian)

Labourers push wooden boards before carrying them to construct a temporary pontoon bridge over the Ganges river for the upcoming Hindu festival of Magh Mela in Allahabad on November 24, 2019. The Magh Mela is held every year on the banks of Triveni Sangam – the confluence of the three great rivers Ganga, Yamuna and the mystical Saraswati – in Allahabad during the Hindu month of Magh which corresponds to mid January – mid February. (Photo by Sanjay Kanojia/AFP Photo)

A tree stands in a lake in Usingen near Frankfurt, Germany, Wednesday, March 22, 2023, the World Water Day. World Water Day was established in 1992 by the United Nations to spread awareness about the water condition all over the world. (Photo by Michael Probst/AP Photo)

A Hindu devotee takes sand bath at Sangam, the confluence of the rivers Ganges and Yamuna, in Prayagraj, in the northern Indian state of Uttar Pradesh, Monday, June 5, 2023. Prayagraj in the northern Uttar Pradesh state is an important Hindu pilgrimage center. (Photo by Rajesh Kumar Singh/AP Photo)

Harvesting water lilies in Dhaka, Bangladesh in the last decade of August 2023. (Photo by Mostafijur Rahman Nasim/Solent News & Photo Agency)

A child dressed in a Santa Claus costume reacts, on the day Palestinian Christians attend an Orthodox Christmas Mass at the Greek Orthodox Saint Porphyrius Church, amid the ongoing conflict between Israel and Hamas, in Gaza City on January 7, 2025. (Photo by Dawoud Abu Alkas/Reuters)

Japan's delegation gather to sign the formal surrender document on the U.S. Navy battleship USS Missouri in Tokyo Bay in a September 2, 1945 file photo. (Photo by Reuters/US Navy)

A cosplayer dressed as Batman wearing the Hellbat suit crosses the road during Day 1 of New York Comic Con at Javits Center on October 07, 2021 in New York City. Comic Con has returned this year after being cancelled in 2020 due to the coronavirus pandemic. (Photo by Alexi Rosenfeld/Getty Images)