It immigration and human-rights advocates argue that addressing the crisis will require Europe to look beyond its watery border and the people who seek to ferry refugees across it. 
The solution is very simple, and I don't know why the European Union is not interested in implementing it. Just send a few thousand NATO forces to the major Libyan and Tunisian ports. Take control of the ports, and destroy all the ferries and boats owned by the human smugglers. Never allow any refugee to board on a boat or ferry.