4condtions on the slave ship

Seasickness, heat, lack of sanitation, and a constant threat of disease.

Explanation:

Seasickness was common and the heat was oppressive. The lack of sanitation and suffocating conditions meant there was a constant threat of disease. Epidemics of fever, dysentery (the 'flux') and smallpox were frequent. Captives endured these conditions for about two months, sometimes longer.