Every day, thousands of migrants arrive in the Costa Rican border city of Paso Canoas. Exhausted after crossing the Darien Gap jungle on foot -- full of wild animals, harsh terrain and criminal gangs -- they find themselves in makeshift camps where diseases run wild. The situation has urged authorities to open the brand new Temporary Attention Centre for Migrants (CATEM), set to welcome 3,000 people before they head off to the US.