Deep down into the big blue

Li Da, a Chinese underwater model, freedives with jellyfish in a mermaid suit in western Pacific country of Palau. [Provided by Yue Hongjun to China Daily]

For some this sport may seem like dicing with death, but for others it has become the ultimate adrenaline rush

This is simply going to take your breath away: Put on a mask, don a pair of fins and plunge into the deep blue. Welcome to the sport of freediving, in which there are no air tanks, no mechanical equipment, just you plunging into the water and staying well under the surface with just one breath.