Protesters against large cruise ships docking in Venice are doing all that they can to stop the ships. A protest on Sunday caused several delays for cruises departing the city.

Seatrade Insider reports that several cruise ships left the Italian city later than planned as roughly 70 small boats operated by protesters took over the water while hundreds more protested from land. Among the ships that faced delays on Sunday was the 3,000-passenger Costa Fascinosa, 1,712-passenger MSC Opera and 2,536-passenger MSC Musica.

This protest, led by the No Grandi Navi (No Big Ships) organization, is part of an ongoing mission to stop cruise ships from coming into the port as locals have are afraid of potential damage.

The protestors believe that the large cruise ships, which pass within yards of Venice's Piazza San Marco, are causing environmental damage to the land. They claim that the ships are too big compared to the city and that the water churned up by them cause damage to Venice's delicate foundation. They fear that the ships may also be impacting historical treasures of the city.