Kleifarvatn south of Reykjavik has unique diving. Near these bubbles are a deeper hole where the water rumbles and pulses, but the cave was to dark to film, with poor visibility. It was like entering a volcano or gates of hell or something, with the rumble and shaking going through your body. A wider area had these decorating vents coming up ... activity here really got going after an earthquake in 2002. ... "Paul Olai-Olssen" www.paulsplanet.no "Pauls planet" Iceland diving Kleifarvatn ...