ocean

A long-distance swimmer dives into the Atlantic Ocean at dawn, Friday, July 24, 2015, in Falmouth, Maine. The woman is part of a group that regularly starts their day with a 2-mile swim. Many of the swimmers keep a float tethered to their bodies for safety

Robert F. Bukaty/AP

A long-distance swimmer dives into the Atlantic Ocean at dawn on Friday, in Falmouth, Maine. The woman is part of a group that regularly starts their day with a 2-mile swim

The moon sets in the early morning hours as a man walks along an ocean pier in Oceanside, California on Thursday

Mike Blake/Reuters

The moon sets in the early morning hours as a man walks along an ocean pier in Oceanside, California on Thursday

Visitors look at fish in the aquarium inside the Chimelong Ocean Kingdom in Zhuhai on April 29, 2014.  The park which claims to be the world's largest ocean theme park was built at an estimated cost of USD3.3 billion and opened in March of this year.

Mark Ralston/AFP

Aquarium visitors take in the submarine view at the Chimelong Ocean Kingdom in Zhuhai, Guangdong province, China on Tuesday. The ocean theme park claims to be the world’s largest and opened in March.

The Row2Recovery Team, made up of four British soldiers, light flares as they cross the finish line off the coast of the Caribbean island of Antigua after rowing across the Atlantic Ocean. PRESS ASSOCIATION Photo. Issue date: Wednesday January 22, 2014.

Ben Birchall/PA

The Row2Recovery Team, made up of four British soldiers, light flares as they cross the finish line off the coast of the Caribbean island of Antigua after rowing across the Atlantic Ocean on Wednesday.