This image shows the Middle Passage immersive in the middle gallery. You can see its curved outer wall - there are two walls which form almost a peanut-shape which you go inside. The text on the wall, in case you can't read it, says:
My hopes of returning home again were all over.
shall speak of the wretched sea
that washed ships to these shores
of mothers cryin for their
young swallowed up by the sea.