The ship drifts downriver for four more days without incident. On the fifth day, there is a bizarre experience in which the ship briefly falls into open space, then turns and falls in a different direction; following this, the vesser seems to be rising.
After five days of travel in this fashion, one of the sailors sees light ahead. Within the hour, the Sea-Gallop has returned to the surface, somehow in a tropical swamp. There is barely room to maneuver, and Tarkson orders the anchor dropped to keep from being dragged onto one of the many sandbars. The air is hot and humid, filled with the drone of insects and the call of strange birds. The sun blazes high overhead, its harsh light filtered by the gigantic trees.