'Practically impossible' to rescue missing Titanic sub says US oceanographer

US research oceanographer at University of San Diego, Jules Jaffe, says it is "practically impossible" to find the OceanGate sub “in a mangled wreck", within the next 36 hours. Jaffe was part of the team that found the Titanic wreck in 1985.

All communication was lost with the 21-foot (6.5-meter) craft, named Titan, during its descent Sunday to see the remains of the British passenger liner.