Loki's Castle (IMAGE) Uppsala University Caption Image of a hydrothermal vent field along the Arctic Mid-Ocean Ridge, close to where 'Loki' was found in marine sediments. The hydrothermal vent system was discovered by researchers from the Centre for Geobiology at University of Bergen (Norway). Credit Centre for Geobiology (University of Bergen, Norway) by R.B. Pedersen. Usage Restrictions May be published in connection to reports about the study 'Complex archaea that bridge the gap between prokaryotes and eukaryotes' . License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.