One of the five crew missing in a submersible while exploring the Titanic wreck had previously given a chilling message about the dangers of deep-sea exploring.
The three identified so far are said to include billionaire British explorer Hamish Harding, French submersible pilot Paul-Henry Nargeolet and CEO of OceanGate Expeditions Stockton Rush.
Mr Nargeolet previously spoke frankly of the extreme dangers of deep-sea exploration in an interview.