These underwater photos are from Pinewood Studios. In this vast pool, commercials, music videos, episodes of various TV shows are shot. The "film set" is a huge reservoir of 1.2 million liters of water. The temperature of the water is always around 32 degrees Celsius so that the actors feel comfortable.
The underwater stage feature stars such as Keira Knightley, Myleene Klass, Sharon Stone and Matt Lucas, who have all swum in the giant tank.
Source: dailymail