Based on the information in the excerpt, Olaudah Equiano Is clearly expressing the experiences of enslaved Africans during a process called

The middle passage

Explanation:

The middle passage was when the africans crossed to the Americas in a ship with a "cargo" of slaves. It was called like that because it was the middle section of a trade route with many ships.

The other two passages were the "Outward passage", that went from Europe to Africa and the "Return passage" from the Americas to Europe.

Equiano is describing a process called the middle passage