Migration at Sea: Unintended Consequences of Search and Rescue Operations by Claudio Deiana, , and "smugglers responded to these operations by shifting from seaworthy wooden boats to flimsy inflatable rafts"
"Unintended Consequences of Search and Rescue Operations" by Deiana et al. just out. This is likely to be the most rigorous study on the very difficult topic of SAR in the Mediterranean so far:
The Peltzman effect characterizes migrant crossings to the EU. Migrants will take crappy boats in rough seas *if* they expect to be rescued by the Italian Navy, NGOs, etc