A 19-year-old American content creator who was trying to fly solo to all seven continents was detained by the Chilean authorities this week after they said he had landed his plane on an island off Antarctica without authorization.

The teenager, Ethan Guo, said in an interview on Thursday that he was being housed at a Chilean base on King George Island, roughly 75 miles off the coast of Antarctica, as the case against him proceeds.

Chilean officials said on Thursday that although Mr. Guo had initially been detained, he was now free to leave the island as long as he remained in Chile until his case is resolved.

Mr. Guo had been documenting his journey around the world on TikTok, where he has more than 329,000 followers, and Instagram, where he has about 1.3 million followers.

Mr. Guo, who obtained his pilot’s license at 17, was aiming to become the first person to fly solo in a small aircraft to all seven continents, according to his website, and was hoping to raise $1 million for cancer research.

Antarctica was the only continent where he had yet to land, he said. On Saturday at about 5:30 a.m., he took off from Punta Arenas, a city near the southern tip of Chile, with a flight plan indicating that he was going to fly over the city and land again in Punta Arenas, prosecutors said.