Mediterranean Sea factors. The opening of the Suez Canal in 1869 created the first salt-water passage between the Mediterranean and Red Sea. The Red Sea is higher than the Eastern Mediterranean, so the canal serves as a tidal strait that pours Red Sea water into the Mediterranean. The Bitter Lakes, which are hyper-saline natural lakes that form part of the canal, blocked the migration of Red Sea species into the Mediterranean for many decades, but as the salinity of the lakes gradually equalised with that of the Red Sea, the barrier to migration was removed, and plants and animals from the Red
The Red Sea Sharks even labyrinthine" story which was "undoubtedly the book in which Hergé ventured furthest into the creation of his own universe." He thought that "Hergé enters a new phase" with "The Red Sea Sharks", as its author "seems to know his family of characters better and better, and he enjoys playing with them and his readers." Peeters noted that the book was "in some respects a continuation" of "Land of Black Gold", an assessment shared by Thompson, the Lofficiers, and Farr, all of whom described it as a partial sequel to the earlier book. Thompson added that "The Red Sea Sharks"