Oh, how good it is to dive! Preferably in a warm sea, with a bunch of interesting and beautiful underwater creatures. Like this jellyfish, for example. I believe that it is one from Rhizostomeae order, but I can't say which species it belongs to. Met it while diving off Negros Island, Philippines. It was an unforgettable week underwater :)
It's better to watch the photo in high resolution.
OLYMPUS E-M5 MarkII
Exposure time: 1/200 sec
Aperture: F 5
Sensitivity: ISO 200
Focal length: 8 mm
35 mm equivalent: 16 mm
You can also see my photos in my blog LJ and in my profile on NatGeo