Swimming is supposed to give you a healthy glow, but these swimmers weren’t quite sure what was going on when they took a late-night dip and turned a fluorescent shade of blue.

‘It was like we were playing with radioactive paint,’ said photographer Phil Hart who snapped the bizarre sight as his friends emerged from a lake in the dark of night.

The light is created by a chemical reaction called bioluminescence, which happens when a naturally-occuring micro-organism in the water is disturbed.

These images are particularly stunning because the concentration of the micro-organism ‘Noctiluca Scintillans’ was abnormally high when he took the photos at Gippsland Lakes in Victoria, Australia.

source:  dailymail.co.uk