Illusionist David Blaine is recovering in a private hospital after walking free from his Perspex box in London on Sunday night at the end of a 44-day starvation stunt. Crowds had packed the area near London's Tower Bridge to see the 30-year-old American emerge at 2200 BST, clearly weakened by his apparent endurance test. The illusionist will undergo tests to discover whether he has suffered any long-term damage from his starvation stunt. "This has been one of the most important experiences in my life," he said, before breaking down into sobs during a live programme on Sky One. After his release, Blaine - who had nothing but water during his stunt - was put on a stretcher by paramedics and taken to hospital. Blaine's box was tipped on its side to allow the illusionist to walk out. To cries of "take your time" from his aides, Blaine took the microphone and told how his experience had been an education. "I have learned more in that box than I have in years," he said. About 10,000 people who looked on were mostly good humoured and full of words of support for the illusionist. Christine Hunt, 44, who travelled from Doncaster, Yorkshire, said: "We've already been down once to see him and I think it's brilliant, what he's doing." A nutritional expert has warned that Blaine risks death if extreme care is not taken when he begins eating again. Professor Marinof Elia, from the University of Southampton, said the illusionist could be at risk from serious problems, including a ruptured stomach and sudden death.