Near the entrance of Caesar Clown's lab, the situation for Nami’s group and the G-5 Marines turns bizarre.

Luffy, who is weakened by the cold and the water due to his Devil Fruit, sinks into the icy depths.

ends up in Nami's body (much to his delight and Nami's horror).

After surviving the water, the group strips the defeated centaurs of their warm coats to survive the extreme cold. Chaos at the Research Lab