James Michael Grimes, who treaded water for a large part of Thanksgiving Day before he was rescued, doesn't remember falling off the Carnival Valor, he said in an interview aired Friday on "Good Morning America."His eventual rescue, which happened after a bulk carrier crew saw him in the water and alerted the US Coast Guard, was "one of those Thanksgiving miracles," a Coast Guard official has said.The next many hours -- perhaps more than 15, the Coast Guard has said -- Grimes just tried to stay afloat and was "dead set on making it out of there," the told ABC.The water temperature in the Gulf was just above 70 degrees on Thanksgiving night, Lt. Seth Gross, a search and rescue coordinator for the USCG, told CNN last week.Grimes eventually saw lights from a tanker ship, and swam toward it, he told ABC."