Hikers in California have discovered human remains in the area of California where Hollywood actor Julian Sands disappeared earlier this year.
According to reports, the other submersible, called Limiting Factor, is owned by video game developer Valve Software CEO Gabe Newell.
Sidonie Nargeolet said her 77-year-old father had been near the Titanic wreck 30 times, the first in 1987.
Emanuela Orlandi, the daughter of a Vatican usher, failed to return home on June 22, 1983 following a music lesson in Rome. She was 15 at the time and lived inside the Vatican City.
Five passengers were on the missing submersible that can keep them alive underwater for a maximum of 96 hours.
A five-person submersible vessel taking tourists on a $250,000 trip to see the wreckage of the 1912 Titanic disaster 12,500 feet (3,800m) undersea is missing in the Atlantic off Canada.
A submersible vessel taking tourists on a deep ocean journey to view the wreckage of the Titanic has been missing since Sunday. One pilot and four passengers are aboard.
It is not yet known how many people are missing aboard the sub, but one British billionaire was confirmed to have been on board.
Rescuers, supported by search dogs, had previously found discarded fruit the children ate to survive, as well as improvised shelters made with jungle vegetation.
Portuguese police searched a reservoir for three days after reports that a person of interest in the case was there days after McCann went missing.