Bocagrande was the main entrance to the Outer Bay until March 17, 1640, when a ship and two Portuguese galleons were grounded. Two years later, the accumulation of sand, mangroves and West Indian cocoa plum trees made it possible to cross the old channel on foot. The change in the currents opened the until-then-impracticable Bocachica passage, which became the only maritime access to Cartagena. It was then that the powerful need to modify the defensive system of the island of Tierrabomba arose.

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