In a stunning new book of photographs, aerial photographer Yann Arthus-Bertrand and underwater snapper Brian Skerry observe our relationship with the sea. To mark Earth Day, take a dip
Green algae in shellfish beds in Saint-Brieuc Bay, Côtes-d'Amor, France Photograph: Yann Arthus-BertrandPhotograph: PRSoft corals known as sea pensPhotograph: Brian SkerryAn eroded iceberg in Unartoq fjord, GreenlandPhotograph: Yann Arthus-BertrandA clown goby at the window of its shelter (a rusty soda can) in Izu Peninsula, Honshu, JapanPhotograph: Brian SkerryThe Great Blue Hole, a submarine sinkhole in the centre of the Lighthouse Reef Atoll, Belize Photograph: Yann Arthus-BertrandA grey seal in the waters off Acadia National Park in Maine, USAPhotograph: Brian SkerryCrowds on Ipanema Beach at Rio de Janeiro in BrazilPhotograph: Yann Arthus-BertrandBrian Skerry photographing an adult southern right whale, (Eubalaena australis) at a depth of 22m off the sub-Antarctic Auckland Islands, New Zealand.Photograph: Thames and Hudson