Marco Cortesi on December 17, 2010 arch blue hole dahab dahab divers technical DDT Marco Cortesi tom steiner van den Ouweelen Trimix courses dahab +
102 meters at the Blue Hole and no Sharks :-) on December 07, 2010 Abu Talha Canyon Dahab advanced trimix arch blue hole dahab dahab divers technical shark attack egypt 2010 sharm el sheikh tom steiner +