Discoveries from wrecked slave ship Sao JoseUpdated 1421 GMT (2221 HKT) June 1, 2015 Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds. Photos: Iron ballast recovered from the Sao Jose slave ship wreck. The ballast helped to weigh down the slave ship and its human cargo.Hide Caption 1 of 3 Photos: Between 2010 and 2011, Iziko Museum archaeologist Jaco Boshoff discovered an account of the wreck lodged by the captain of the ship, which rekindled interest in the site.Hide Caption 2 of 3 Photos: Copper fastenings and copper sheathing were also uncovered. It's believed that the fastenings held the structure of the ship together and the sheathing provided exterior protection.Hide Caption 3 of 3Archaeologists have confirmed the first ever discovery of a sunken slave ship off the coast of Cape Town, South Africa.More from AfricaMost of kidnapped schoolgirls freed, Nigeria saysHow businesses in Cape Town keep the taps from running dryFirst they were burned and whipped, then their families were sent the videosThe sex trafficking trail from Nigeria to EuropeThe world's last male northern white rhino is dead. Now what?