On a cold, rainy morning a few weeks ago, eight black inflatable rafts, loaded with migrants, bob in the waters off the northern shore of the Greek island of Lesbos.
One of them isn't moving.
Vassilis Hantzopoulos of the Hellenic Red Cross points to the horizon.
"This boat up there?" he says. "No engine. Failure of the engine. That's it. So they ask for help from the coast guard."
A Norwegian rescue boat with the European Union's border agency, Frontex, heads toward the distressed raft.