Ethiopian Airlines female pilots prepare the plane before takeoff at Bole international airport in the capital Addis Ababa, November 19, 2015. Ethiopia Airlines on Thursday, dispatched its first ever all-female operated flight. Every aspect of the journey was handled by women, from the ground crew, aircraft maintenance to traffic controllers. Gualu and her co-pilot were charged with flying the crew and passengers to Bangkok, Thailand. (Photo by Tiksa Negeri/Reuters)

Shimmering clearest blue and stretching as far as the eye can see, this is one of Iceland's famed crystal ice caves. The giant solid waves look frozen in time but they are slowly moving along as part of the Vatnajokull Glacier – which stretches across eight per cent of the island. The images were captured in February 2014 by British photographer Rob Lott, 49. Photo: A wide view of Rob Lott in the crystal ice cave in the Vatnajokull Glacier, Iceland. (Photo by Rob Lott/Barcroft Media)

Sculptor Jiri Genzer of the Czech Republic carves an ice sculpture at the Disney Dreams Ice Festival in Antwerp November 27, 2014. Some 60 artists from all over the world participated in the festival, making sculptures out of around 500 tonnes of ice. The festival will open on November 29 until January 11, 2015. (Photo by Yves Herman/Reuters)

Workers carve ice art works at Harbin Ice and Snow World one day before the 32th Harbin International Ice and Snow Festival in Harbin city, China's northern Heilongjiang province, 04 January 2016. The festival will run from 05 January to 05 February. (Photo by Wu Hong/EPA)

Ice sculptures based on the caracters by Walt Disney are shown at the snow and ice sculpture festival on December 15, 2011 in Brugge, Belgium. (Photo by Mark Renders/Getty Images)

A female Marine prepares to throw a practice grenade during Marine Combat Training (MCT) on February 21, 2013 at Camp Lejeune, North Carolina. Since 1988 all non-infantry enlisted male Marines have been required to complete 29 days of basic combat skills training at MCT after graduating from boot camp. MCT has been required for all enlisted female Marines since 1997. About six percent of enlisted Marines are female. (Photo by Scott Olson)

Taronga's first female elephant calf explores the paddock with her mother Pak Boon at Taronga Zoo on November 3, 2010 in Sydney, Australia. The 120kg elephant was born at 1:12am and is Taronga's first female calf and fifth born to The Australian Conservation Management Plan for endangered elephants. The calf will be given a Thai name to reflect the herds' cultural origin. (Photo by Brendon Thorne/Getty Images)

In this handout image provided by Red Bull, Artem Silchenko of Russia dives from the 27 metre platform at training on Hong Island in the Andaman Sea during the final stop of the 2013 Red Bull Cliff Diving World Series on October 25, 2013 at Krabi, Thailand. (Photo by Romina Amato/Red Bull via Getty Images)