It is interesting, because he isn't really "rescued," but rather "salvaged" when his lifeboat comes on shore in Mexico. He and Richard Parker got lucky, finally, when their lifeboat finally came into contact with land. Pi manages to, through great effort, get his lifeboat onto the shore safely. Richard Parker immediately leaps out and runs into the jungle, without even a glance back. That event, Pi says, hurts him more than he would have thought. He comments,
"I wept like a child...because Richard Parker had left me so unceremoniously."
Pi is then discoverd by women in a village who bathe and feed him before he is picked up by the police and taken to the hospital.
In the hospital, he is questioned by Japanese officials who are investigating the sinking of his ship months before. This is where we learn that there is another possible story that Pi was covering with the animal story, one that is much more tragic and horrifying. The Japanese officials get caught up in the entire thing--animal story AND human one, and are engaged in Pi's recounting of events. Pi lets them decide which story they like better, and that pretty much sums it up.
I hope that helped; good luck!