A woman dives and pretends to ride a bike in Underwater Park in Pula, Croatia, August 1, 2017. (Photo by Antonio Bronic/Reuters)

Seth Casteel is an award-winning photographer and the New York Times Best Selling Author of Underwater Dogs. His new book, Underwater Puppies, was published September 16, 2014. Photo: “Underwater Puppies”: Popcicle. (Photo by Seth Casteel)

Sjinkie Knegt of Netherlands, left, and Park Se-Yeong of South Korea crash out as they compete in a men's 1500m short track speedskating final at the Iceberg Skating Palace during the 2014 Winter Olympics, Monday, February 10, 2014, in Sochi, Russia. (Photo by Bernat Armangue/AP Photo)

“In 2009 a monumental underwater museum called “MUSA” (Museo Subacuático de Arte) was formed in the waters surrounding Cancun, Isla Mujeres and Punta Nizuc. The project founded by Jaime Gonzalez Cano of The National Marine Park, Roberto Diaz of The Cancun Nautical Association and Jason deCaires Taylor consists of over 450 permanent life-size sculptures and is one of the largest and most ambitious underwater artificial art attractions in the world”. – UnderwaterSculpture (Photos by Jason deCaires Taylor/Intrepidacious/Kozy and Dan Kitchens)

Opera singers perform in the pool “AquAria PALAOA” during a rehearsal at the swimming pool Neukoelln on April 27, 2011 in Berlin, Germany. The premiere of the underwater opera AquAria PALAOA is on May 1st. (Photo by Andreas Rentz/Getty Images)

National Diving School director Jerome Vincent, wearing a Gandolfi space suit, executes training procedures in a swimming pool in Marseille October 22, 2014. The underwater test session develops European expertise in spacewalk simulations under partial gravity for exploring the Moon, asteroids and Mars.The training is organised by Comex, a French company specializing in engineering and deep sea diving operations, in collaboration with the European Space Agency (ESA) and with Apollo XI “Under the sea”. (Photo by Jean-Paul Pelissier/Reuters)

In a picture taken with an underwater camera, a couple stands in front of a Polynesian priest during their underwater wedding ceremony on October 25, 2014 in Bora-Bora, in French Polynesia. The ceremony lasts twenty minutes and costs around 2700 euros. (Photo by Ben Thouard/AFP Photo)