At the border between Poland and Ukraine, customs officers measure the oxygen level in a lorry to ensure no illegal immigrants are hiding. A videoscope is then used to check inside closed cabins and sophisticated computers screen passports to ensure they are genuine. Customs officials know that hundreds of thousands of would be immigrants are hiding in Ukraine, waiting to cross into Poland. It's their job to stop them. "It's not easy to guard 300 km of border," complains one guard. As Europe becomes more concerned about freedom of movement, patrolling the Polish-Ukraine border has become paramount to stemming the tide of illegal immigration.

Produced by EO TV