https://phys.org/news/2018-07-red-sea-flushes-faster-flung.html

Until now, research has suggested that the Red Sea's deep water is relatively stagnant, taking some 36 to 90 years to renew, and that its main source of renewal is water flowing from the northern Gulfs of Suez and Aqaba into the sea's main basin.

KAUST Associate Professor Ibrahim Hoteit, who specializes in earth fluid modeling, with Fengchao Yao, a physical oceanographer, used an ocean circulation simulator to gain further insight into the circulation of the Red Sea's deep water.