Italy's Prime Minister Silvio Berlusconi has agreed that work on an underwater dam to try to save the lagoon city of Venice from floods will go ahead, despite increasing calls for it to be halted because of environmental damage. Work on the project known as Mose, Italian for Moses, began in 2003. Designers hope the construction of underwater barriers will protect the fragile canal city from the ravages of the sea. The project aims to construct 78 flood barriers, 20 metres (65 feet) wide and up to 28 metres (92 feet) high, that will be fixed to the bed of the sea at points where Venice's lagoon meets the Adriatic. Venice's mayor Massimo Cacciari, supported by environmentalists and Venetian elders, had asked Berlusconi to consider other measures, arguing the barriers would cause as much damage to Venice as they prevent. The World Wildlife Fund Italy has said that shutting Venice's cargo port and barring cruise liners from entering the lagoon would be more effective in controlling the waters. There are also concerns about the cost of the scheme.