Underwater photographer Alexander Semenovs has snapped some of the most stunning, fragile life forms anywhere on planet Earth. Shot in deep, dark conditions, the images continue to provide an insight into what lies beneath, with glowing creatures appearing a lot like aliens in the pitch-black water. Semenovs has shot the likes of bioluminescent jellyfish, aggressive-looking worms and many species that leave a lot to the imagination. The 30-year-old from Moscow does the majority of his work in the White Sea, near the Arctic Circle. Here: A Comb jelly – Beroe cucumis. (Photo by Alexander Semenovs/Caters News)

From London to New York! These action shots show talented athletes practising yoga poses in iconic city locations. The amazing snaps were taken by photographer Kristina Kashtanova at urban street locations in the UK and New York. The talented yogis are seen striking mind-boggling poses in the most unusual settings. Here: Yoga head stand, Brooklyn, New York. (Photo by Kristina Kashtanova/Caters News)

It's often said that pets and their owners can start to look alike, but these adorable photographs take the old mantra to a new extreme. They are the work of Svetlana Valyiskaya (27), from St Petersburg, who snaps pets in everyday poses in her spare time from her job as a commercial photographer. The vibrant costumes and scenes, which Svetlana designs herself, have made the photos a hit in her native Russia – and it's not hard to see why. She said: “I really love animals, they are loyal, faithful and true and always interesting to work with – plus they never criticise the photographs afterwards”. (Photo by Svetlana Valyiskaya/Mercury)

An aircraft passes over houses at it lands at Heathrow Airport near London, Britain, December 11, 2015. Picture taken December 11, 2015. (Photo by Neil Hall/Reuters)

Soldiers stand in line outside portable toilets during a military parade to celebrate the 206th anniversary of Colombia's independence in Bogota, Colombia, July 20, 2016. (Photo by John Vizcaino/Reuters)

A Mercedes-Benz car is pictured in a production line at the plant of German carmaker Mercedes-Benz in Bremen, Germany January 24, 2017. (Photo by Fabian Bimmer/Reuters)

Dogs pose for a photo in the likeness of a photo time line of Face Book during the “Blocao” dog carnival parade in Rio de Janeiro, Brazil, Saturday, February 14, 2015. (Photo by Silvia Izquierdo/AP Photo)

Performers line up during the closing ceremony of the 2014 Winter Olympics, Sunday, February 23, 2014, in Sochi, Russia. (Photo by Darron Cummings/AP Photo)