Chapter 608 Paradise in the Bottom of the Sea
They plunge into Fishman Island but the coating gets broken by a soap. [Uh... that's what it says. Unless "Shabon" is a name.]
Because they were in the ocean, the whole crew gets washed away and Usopp, Chopper, Sanji, and Luffy are saved by Caimy and some others. Luffy safely regains consciousness.
The status of the other crewmates is unknown.
They get guided by Caimy and walk to lots of different places.
They encounter some mermaids.
Sanji is so happy he cries even more than when he left the Baratie.
Caribou's barrel is washed ashore there, too.
It seems some mermaids opened it up. Caribou is silent...
Finally, we see the silhouette of the head of the New Fishman Pirates
"Bring Straw-Hat Luffy here..."