Most of the times there are dropped a few miles away from the African coasts, with a good coordination between the smugglers and the NGOs. They then spend the essential of their travel in safe ships. They could travel less if the NGOs policy was to save them and return them to Africa.
Those NGOs are smugglers.
The solution is to take these people from the sea back to where they came from. The idea to rescue them onto a small island so they can flood Europe has been tried, doesn’t work, it only causes more people to try to cross over.