Historian Kevin Dawson, associate professor of African Diaspora studies at the University of California, Merced introduces Susan Morrison to the hidden underwater world of the Africans who dived for Spanish silver - enslaved by pirates yet masters of their skilled and dangerous craft beneath the waves. Dr David Wilson of Strathclyde University tells how the Caribbean came to be hoaching with those pirates in the first place and what a Scot had to do with it. And get a taste of Dr Hannah Telling’s research on gallus and outspoken Dundonian women as Mrs Hackney holds forth.