London's River Thames is now home to four ghostly figures who emerge from the water twice a day.
The underwater sculptures represent four figures seated on horseback, although the animal's heads have been replaced with oil pumps.
See also: Why is this mysterious statue of Christ underwater?
Two of the animals have their heads bowed to the ground while the other two face forwards.
The sculptures were designed and created by British artist Jason deCaires Taylor.
He said: "(The sculptures) ask questions about dependence on fossil fuels. I'm hoping that the Rising Tide shows how critical our situation is and time is not on our side, and we need to change our dependence on fossils fuels."
See also: Underwater statue in Malta
The sculptures can be found on the Thames foreshore near Vauxhall Bridge.
DeCaires Taylor created the world's first underwater sculpture park in the Caribbean Sea in 2006. The Molinere Underwater Sculpture Park can be found off the coast of Grenada and it consists of a number of cement figures that are installed on the ocean floor.
According to the artist's website the sculpture park has been named among the Top 25 Wonders of the World by National Geographic.
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