Campaigners says government crackdown has led some people to resort to desperate measures
The discovery of 39 people dead in the back of a lorry in Essex has renewed focus on the risks taken by undocumented migrants to travel to the UK to seek safety and shelter.
A lack of safe and legal routes into the UK is in part driving a dependence on life-threatening methods including squeezing into the back of refrigerated lorries or riding in vulnerable dinghies across wild seas.
Read More Lorry horror highlights risks migrants take to try to reach UK