"We are here in the hope our pictures can put a human face on this crisis," writes the AFP photographer Christophe Archambault, who travelled to the Andaman Sea to find a boat carrying hundreds of migrants from the persecuted Rohingya minority, adrift off the Thai coast. "My first reaction is shock. Their faces are completely emaciated. You can see their ribcages, their pointed shoulder bones. We are witnessing a situation of absolute horror."