Understanding Why EU-Bound Refugees Risk Their Lives to Cross Mediterranean

A look at the history behind recent refugee shipwrecks and deaths.

In the video above, ABC News documents the perils these refugees face and the numbers behind the crisis.

Videos taken by people on the boats have shown unfit living conditions. And the risks run high, including rough seas and crowded and dangerous ships.

More than 35,000 refugees have arrived by boat in Europe this year, and an estimated 1,600 have died on the journey, according to the International Organization for Migration.

The Associated Press contributed to this report.