Danny Lee, Sapphire window (February theme: Windows)

While diving at wild Pedra Branca in the Southern Ocean, I stumbled across the entrance to a large cavern in the cliff face. The sapphire blue window beckoned me to enter, and so I did. And wow!...

Images have been resized for web display, which may cause some loss of image quality. Note: Original high-resolution images are used for judging.