Sperm whale. (Physeter macrocephalus). The tail of a sperm whale raised high for a deep dive. Caribbean.

Humpback whale (Megaptera novaeangliae) wth tail flukes high in the air. Alaska

Guests from the Lindblad Expedition ship National Geographic Explorer take the Polar Plunge off ice floe in the Weddell Sea, Antarctica, Southern Ocean

Blue whale (Balaenoptera musculus). The huge tail of a blue whale raised high before a deep dive. Gulf of California.

After the jump of a cliff jumper on the beach on the Promenade des Anglais in Nice, Cote d'Azur, Southern France, France, Europe

Diving safari ship MS Keana with diving dhoni anchored off an uninhabited palm island, Ari Atoll, Indian Ocean, Maldives, Asia

Diving safari ship MS Keana off an uninhabited palm island, Ari Atoll, Indian Ocean, Maldives, Asia

Diving safari ship MS Keana anchors off uninhabited palm island, Ari Atoll, Indian Ocean, Maldives, Asia

Bridge Jump Festival, traditional jump from the Stari Most Bridge into the River Neretva, Mostar, Bosnia and Herzegovina

The Blue Pools of Makarora offer enticing blue waters to swim in. A man jumps off a bridge into the water in Mount Aspiring National Park; Makarora, New Zealand

The Blue Pools of Makarora offer enticing blue waters to swim in. A man jumps off a bridge into the water in Mount Aspiring National Park; Makarora, New Zealand

Athletic swimmer mid-air against blue sky

Athletic swimmer mid-air against blue sky

Athletic swimmer mid-air against blue sky

Athletic swimmer mid-air against blue sky

Athletic swimmer mid-air against blue sky

Athletic swimmer mid-air against blue sky