(CNN) -- A mysterious castaway claiming to have been lost at sea for 13 months is now safely back on land, but many questions remain about how he could have lived on his small boat for so long as it drifted across the Pacific Ocean.

The man calling himself Jose Ivan Alvarengo turned up in a heavily damaged boat on a remote coral atoll in the Marshall Islands, claiming that he had been living off fish and turtles he had caught and relying on rainwater, and sometimes his own urine, to drink.

Authorities are trying to determine the veracity of Alvarengo's story.

Map: Drifter found in PacificMap: Drifter found in Pacific

He was found on sparsely populated Ebon Atoll, a 22-hour boat ride from the capital of Majuro, on Thursday. The southernmost of the Marshall Islands' atolls, Ebon has only 2.2 square miles of land, one phone line and no Internet service. The government airplane that services the atoll was not working, so Alvarengo did not make it to Majuro until Monday morning.

Read more at www.cnn.com

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