Gisele Bündchen recalled how she almost died during a scary photoshoot over 20 years ago. “I did a photoshoot on a fake iceberg in Iceland, and I almost fell off into the ocean,” she said during the “True Confessions” segment on Jimmy Fallon’s talk show. The model, 43, said she almost fell into the freezing water, where she “would have been dead in seconds.” “So the whole thing I was supposed to be in this slip dress while everyone was like in a boat — like, all the crew was in a boat with like huge puffer jackets and life vests,” Bündchen, who participated in a campaign for Oxygene at the tim…