How shallow was the Straits of Gibralter during the iCE aGE?

During the last glaciation the sea levels dropped but not enough to enable anyone to cross without needing a boat. The depth would have been about 600 ft, (200 m). Of course tools have been found on the island of Crete which suggest humans were there long before the last glaciation and the only way they could get there would be by boat or raft.