Spartel Island also known as the Majuan Bank, was situated just west of the Strait of Gibraltar and according to Jacques Collina-Girard was the site of Atlantis. There is little doubt that before the last deglaciation Spartel was dry land.
Marc-Andre Gutscher from the University of Brest has added some support to Collina-Girard’s theory based on his interpretation of new bathymetric data and is prepared to debate the viability of human habitation on Spartel around 9600 BC. According to Gutscher a large earthquake hit the island 12,000 years ago. Furthermore, there is also evidence of at least eight subsequent earthquakes, each of which could have resulted in a drop of the seafloor by several metres.
Accordingly Gustcher speculated that Spartel circa 9600 BC could have been 40 metres higher than expected. However, at this early date he would not expect the Bronze Age civilisation described by Plato to have existed on the island and that his sonar investigation did not reveal any suggestion of an extinct civilisation.
Gustcher subsequently withdrew his support for a Spartel Atlantis(a). However, Collina-Girard continues to advocate the idea, expanding on his views in a 2009 book, L’Atlantide retrouvée? Enquête scientifique autour d’un mythe.
Further criticism of Collina-Girard’s theory has been voiced by Alain Moreau(b).
*(b) https://www.mondenouveau.fr/continents-disparus-les-fausses-atlantides-antarctique-ile-du-cap-spartel-partie-4/* (link broken Oct. 2017)