A former TV journalist has shared the terrifying moment he experienced while being trapped in a submarine within the wreckage of the Titanic.
A massive search and rescue operation is still under way in the mid Atlantic after a tourist submarine went missing during a dive to Titanic's wreck on Sunday with five people inside.
Michael Guillen, a former ABC science editor, revealed his harrowing encounter during a visit to the iconic ship's remains in the year 2000.
