We travelled the treacherous human trail to the United States called the Darien Gap. It's a stretch of dense jungle connecting South America with Central and North America. The fittest take days to cross, the feeble - weeks - and some do not make it. Despite a US deal to close it off - record numbers are crossing, and now, an alarming number of children, an eight fold increase, in the first four months of this year. Reporter: Guillermo Galdos Cameraman: Rodrigo Galdos Editor: Tim Bentham Produce