Underwater magicians aim at Guinness record
The sister stayed underwater for 11 minutes, 7 seconds; and the brother for 15 minutes, 58 seconds. They were taken to hospital for tests following their stunt.
It is not known if representatives from the Guinness Book of World Records were present, or if the attempt will be officially recognised.
The current men's record – 13 minutes, 42 seconds, was set by Canadian Robert Foster in 1959.