<p>As many as 500 migrants may have died trying to get to Europe across the Mediterranean Sea.</p><p>The&nbsp;<a href="http://www.unhcr.org/57177c199.html" target="_blank">United Nations Refugee Agency</a>&nbsp;said Wednesday that 41 people survived the shipwreck in mid-April. Survivors said smugglers were attempting to transfer people from a smaller ship to a larger one that was already overcrowded.</p><p>That&#39;s when the bigger boat overturned and sank. The survivors were either still on the smaller ship or managed to swim from the larger vessel to the smaller one.</p><p>The survivors were from Somalia, Ethiopia, Egypt and Sudan. The U.N. said the shipwreck was &quot;one of the worst tragedies&quot; involving migrants in the past year.</p><p><i>This video includes clips from&nbsp;</i><a href="https://twitter.com/ItalianNavy" target="_blank"><i>SOS Mediterranee</i></a><i>&nbsp;and images from&nbsp;</i><a href="https://twitter.com/ItalianNavy" target="_blank"><i>Twitter / @ItalianNavy</i></a><i>.</i></p>