The missing Titanic tourist submarine that went missing on Sunday is now at the "bottom of the ocean filled with water", a Russian naval expert has claimed.
The OceanGate Explorations submarine went missing near the wreckage of the famous cruise-liner at around 4am on Sunday morning.
Four days later the five-person crew has yet to be found despite a huge search-and-rescue operation being launched. And now time is running out with the oxygen expected to run out by 12.08pm on Thursday.