A new book published by the UK Natural History Museum showcases some of the most memorable underwater photographs taken over the last few decades in its annual wildlife photographer of the year competition. Here: Giant gathering by Tony Wu. “The first indication that something extraordinary was going on were the blows, huge numbers of them – the exhalations of huge numbers of whales. Entering the water, the photographer witnessed an extraordinary scene”. (Photo by Tony Wu/Unforgettable Underwater Photography/NHM)

Playful seals. The pair of playful seals swim around each other. Two passionate seals were captured on camera in a tender embrace by underwater photographer Robert Bailey, 50, near the Farne Islands off the Northumberland coast, UK. (Photo by Robert Bailey/Medavia)

People swim underwater at Clovelly Beach on December 14, 2023 in Sydney, Australia. A severe heat wave hit Sydney over the weekend, a precursor of hot and dry conditions expected for the rest of the summer which will also bring heightened bushfire risk. The mercury rose to alarming levels again on Thursday. (Photo by Jenny Evans/Getty Images)

NASA astronauts Stan Love and Loral O’Hara test Axiom Space’s lunar spacesuits underwater on October 1, 2025. The AxEMU suit is designed for the Artemis III mission to the moon’s south pole, due to lift off no earlier than mid-2027. (Photo by NBL/NASA via South West News Service)

A woman browses through kimonos for sale at Boroichi flea market in Tokyo December 15, 2014. In the 16th century, Boroichi was a place for farmers to buy and sell rags, known as boro, for mending clothes and weaving sandals. Now in its 436th year, the original spirit lingers, with about 700 stands hawking fabric, used clothes and piles of rags. Others sell kitchen tools, pottery, seaweed and spices. About 200,000 people flock to the market, which is only open for four mid-winter days a year – two in December and two in January. (Photo by Thomas Peter/Reuters)

People dressed in national clothes sing songs during the regional harvest festival in the town of Dyatlovo, Belarus, November 13, 2015. (Photo by Vasily Fedosenko/Reuters)

A woman stands in the middle of her fire damaged clothes after a massive fire at a market in Port-au-Prince, Haiti, Monday March 20, 2017. The fire raged at the biggest central market in the center of the Capital. (Photo by Dieu Nalio Chery/AP Photo)