An eye for an eye: Photographer Mikhail Mikhailov was startled to see what looked like a human eye staring up at him as he flew over the Pugachevskiy mud volcano in East Russia
More than meets the eye: Following a build-up of pressure, mud is released out of the volcano through fractures in the structure, to create an unusual pattern
Photographer Mikhail Mikhailov, 40, from Sakhalin, East Russia, said: 'I haven't ever seen anything like this before.
'There are quite a lot of mud volcanoes in the world and this one is well-known.
'But I haven't ever seen it looking like an eye!'It was a very strong eruption, the mud was getting out from one point and got spread around evenly.
'It created a very beautiful view, looking exactly like an earth eye especially from a helicopter.
'It is definitely a rare phenomenon.'
Eye on the prize: From high above, the centre of the volcano looks like the pupil, surrounded by a muddy brown iris
The rare phenomenon was caught on camera on the Sakhalin Island to the awe of the 40-year-old photographer