What were the conditions like on the boats that carred the slaves from Africa to the US?

Slaves going from Africa to the US were under very harsh conditions. Sleeping conditions were basically side by side with absolutely no room to even roll over. Moldy bread and stagnant water was the food rations given. Even at that, many went without food, thus leading to death from starvation. Really only approximately 2/3 of the Africans made it to America alive.