That diver is behind the rudder of a merchant vessel in the Fjord at Narvick
Narvick, location of the first sea battle of WW2. The green 'mist' is iron dissolved in water and held in suspension.
More cave awesomeness
2 months and counting...and I will be hanging in that spot! This is the first 'pit' at a cave called Emergence du Ressel in the Lot region of France.