Jaw dropping acid: The psychadelic walls inside the abandoned salt mine in Yekaterinburg, Russia more than 650ft under the surface

Beauty below: Although the patterns appear man-made, they are all formed by layers upon layers of minerals which were mined for their use in fertilizers

Scratching the surface: The mineral carnallite, a hydrated potassium magnesium chloride, decorates the empty tunnels under Yekaterinburg

Although a small part of the mine is still in use, miles of tunnels now lay abandoned and are only accessible with a special government permit.

But that didn't stop photographer, Mikhail Mishainik, 29, from exploring the network of passageways under ground near the industrial city of Yekaterinburg, Russia.

The Russian adventurer spent over 20 hours exploring the dimly lit labyrinth and has stayed overnight on at least three occasions.

But if sleeping 650ft below the Earth's surface isn't nerve wracking enough, Mikhail and his friends are also at risk of gas leaks and landslides.