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Previous bathymetric data acquired in the southern Red Sea by our group show the presence of irregular depressions on the surface of submerged reefs. Whether these geomorphological features are related to an aerial dissolution of carbonates rocks (i.e. karstification), fluids escaping seafloor (i.e. pockmarks, salt tectonic-related...), or submarine dissolution processes (i.e. collapse associated with the dissolution of the underlying salt-rich sediments) would have huge implications on the paleogeography of the Red Sea. The objectives of this project are (1) to better characterize the submerged reefs/terraces and the associated geomorphologies and (2) to analyze surface and shallow surface sediments to better constrain the timing and processes at the origin of their formation. Moreover, acting as a giant trap, we would expect that the potential sediments (pelagic sediments, storm deposits, lagoonal muds, and reef debris) deposited subsequently to the depression’s formation serve as a fantastic proxy for the Quaternary climate records.