Among which group of people did equiano see the most brutal cruelty describe one thing equiano experienced on the slave ship

Olaudah Equiano says that the most brutal cruelty he saw was among the white slavers because he states that he's never seen such brutal cruelty among his people. One thing was the disgusting smells that almost suffocated people because there was no air to breath and there was a lot of smell from body fluids that were all over the ground and there were even dead bodies from people who died during the journey.