How has the caste system of south asia changed over the past few decades?

Over the past few decades, the caste system of the south has changed in terms of its marriage in which the marriage in regards with the caste lines are already relatively rare compared before where it is usually practiced or it is something regarded as normal.

the enslaved people onboard suffered from illness with some frequency

well first we can compare on what the slave masters ate and what the slaves ate well the masters ate fancy great food like chicken rice mash potatose and stuff like that and slaves ate well food that your not suppost to eat like the weird parts of turkey and chicken and slaves master chilled beat and eat and slaves work get beat and get little of sleep there you go