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Nick Vujicic smiles at his camera crew before diving with sharks Thursday, Sept. 5, 2013 in Singapore. Vujicic, a Serbian Australian evangelist and motivational speaker born with tetra-amelia syndrome, a rare disorder characterized by the absence of all four limbs, is in the city-state to give a motivational talk and was visiting "The Shark Encounter at Marine Life Park" at one of Singapore's main tourist attractions in Resorts World Sentosa. (AP Photo/Wong Maye-E) ( Singapore Nick Vujicic )

Australian motivational speaker, Nick Vujicic (C), who was born without limbs, prepares to jump into a shark habitat while protected within a customised acrylic enclosure at Marine Life Park, Resort World Sentosa in Singapore on September 5, 2013. Vujicic is in Singapore for a one-day event where he will be speaking to a 5,000 strong audience. ROSLAN RAHMAN/AFP/Getty Images ( 522557307 )

Nick Vujicic gets some help from a friend to adjust his goggles Thursday, Sept. 5, 2013 in Singapore. Vujicic, a Serbian Australian evangelist and motivational speaker born with tetra-amelia syndrome, a rare disorder characterized by the absence of all four limbs, is in the city-state to give a motivational talk and was visiting "The Shark Encounter at Marine Life Park" at one of Singapore's main tourist attractions in Resorts World Sentosa. (AP Photo/Wong Maye-E) ( Singapore Nick Vujicic )

Nick Vujicic surveys the acrylic enclosure submerged into a shark enclosure to keep him safe while diving among the sharks, Thursday, Sept. 5, 2013, in Singapore. Vujicic, a Serbian Australian evangelist and motivational speaker born with tetra-amelia syndrome, a rare disorder characterized by the absence of all four limbs, is in the city-state to give a motivational talk and was visiting "The Shark Encounter at Marine Life Park" at one of Singapore's main tourist attractions in Resorts World Sentosa. (AP Photo/Wong Maye-E) ( Singapore Nick Vujicic )

Australian motivational speaker, Nick Vujicic (C), who was born without limbs, jumps into a shark habitat while protected within a customised acrylic enclosure at Marine Life Park, Resort World Sentosa in Singapore on September 5, 2013. Vujicic is in Singapore for a one-day event where he will be speaking to a 5,000 strong audience. ROSLAN RAHMAN/AFP/Getty Images ( 522557293 )

Nick Vujicic catches his breath while diving in an acrylic enclosure keeping him safe among sharks Thursday, Sept. 5, 2013 in Singapore. Vujicic, a Serbian Australian evangelist and motivational speaker born with tetra-amelia syndrome, a rare disorder characterized by the absence of all four limbs, is in the city-state to give a motivational talk and was visiting "The Shark Encounter at Marine Life Park" at one of Singapore's main tourist attractions in Resorts World Sentosa. (AP Photo/Wong Maye-E) ( Singapore Nick Vujicic )

Australian motivational speaker, Nick Vujicic (top L), who was born without limbs, swims in a shark habitat while protected within a customised acrylic enclosure at Marine Life Park, Resort World Sentosa in Singapore on September 5, 2013. Vujicic is in Singapore for a one-day event where he will be speaking to a 5,000 strong audience. ROSLAN RAHMAN/AFP/Getty Images ( 522557259 )

Nick Vujicic, right, is accompanied by a life guard as he threads water in an acrylic enclosure keeping safe while diving among sharks, Thursday, Sept. 5, 2013 in Singapore. Vujicic, a Serbian Australian evangelist and motivational speaker born with tetra-amelia syndrome, a rare disorder characterized by the absence of all four limbs, is in the city-state to give a motivational talk and was visiting "The Shark Encounter at Marine Life Park" at one of Singapore's main tourist attractions in Resorts World Sentosa. (AP Photo/Wong Maye-E) ( Singapore Nick Vujicic )

Nick Vujicic gets a helping hand from a life guard to empty water from his goggles after diving into an acrylic enclosure to keep him safe while diving among sharks Thursday, Sept. 5, 2013 in Singapore. Vujicic, a Serbian Australian evangelist and motivational speaker born with tetra-amelia syndrome, a rare disorder characterized by the absence of all four limbs, is in the city-state to give a motivational talk and was visiting "The Shark Encounter at Marine Life Park" at one of Singapore's main tourist attractions in Resorts World Sentosa. (AP Photo/Wong Maye-E) ( Singapore Nick Vujicic )

Nick Vujicic wipes his nose with his shoulders while watching the sharks in an enclosure before diving with them Thursday, Sept. 5, 2013 in Singapore. Vujicic, a Serbian Australian evangelist and motivational speaker born with tetra-amelia syndrome, a rare disorder characterized by the absence of all four limbs, is in the city-state to give a motivational talk and was visiting "The Shark Encounter at Marine Life Park" at one of Singapore's main tourist attractions in Resorts World Sentosa. (AP Photo/Wong Maye-E) ( Singapore Nick Vujicic )

Australian motivational speaker, Nick Vujicic, who was born without limbs, speaks to the press before swimming in a shark habitat while protected within a customised acrylic enclosure at Marine Life Park, Resort World Sentosa in Singapore on September 5, 2013. Vujicic is in Singapore for a one-day event where he will be speaking to a 5,000 strong audience. ROSLAN RAHMAN/AFP/Getty Images ( 522557256 )

Nick Vujicic poses for his camera crew before diving with sharks Thursday, Sept. 5, 2013 in Singapore. Vujicic, a Serbian Australian evangelist and motivational speaker born with tetra-amelia syndrome, a rare disorder characterized by the absence of all four limbs, is in the city-state to give a motivational talk and was visiting "The Shark Encounter at Marine Life Park" at one of Singapore's main tourist attractions in Resorts World Sentosa. (AP Photo/Wong Maye-E) ( Singapore Nick Vujicic )