As there was no manufacture of ships only for the slave trade, to date at least 60 types of adapted vessels have been identified as tombs. They become smaller and faster.
To ensure profit from the trafficking business, overcrowding was constant on the slave ships. In the basements were separated: on one side were men and on the other women and children. Sickness was constant and human waste was constant presence in the reality of basements. They were often cleaned with seawater and vinegar to soften odors and dirt. In this way, many diseases spread to ships and reached ports, such as measles, diarrhea and scurvy.
