Last words heard from Titan sub before 'catastrophic implosion' revealed to public

The harrowing final words uttered last year by crew members onboard the doomed Titan submersible have now been released as part of an enquiry into the tragic incident.

The US Coast Guard launched the official investigation last week in a bid to 'uncover the facts surrounding the incident' which saw all five passengers killed in the hope of 'preventing similar tragedies'.

What happened to the Titan submersible?

In June last year, US marine discovery firm OceanGate embarked on a voyage thousands of metres below sea level, promising four passengers the opportunity to visit the famous shipwreck of the Titanic, which sunk in the Atlantic in 1912.

Tragically, however, just hours into the journey, the tiny vessel - which had an inside space of just 22ft long and 9ft wide with a height of a little over 8ft - lost contact with its mothership.

Those inside - Hamish Harding, Paul-Henri Nargeolet, Shahzada Dawood, Suleman Dawood, and OceanGate CEO Stockton Rush - had travelled 435 miles off the coast of Newfoundland, Canada, when they vanished off the map.

Despite an all-hands-on-deck rescue mission being launched and lasting several days, it was subsequently discovered that the vessel had suffered a 'catastrophic implosion', killing all five passengers.

All five passengers were killed in the implosion (PA)

Tragic final words before the Titan submersible disaster

As part of the ongoing investigation, the US Coast Guard last week shared the final exchange they had with crew members of the Titan before the disaster.

The crew on board the sub had been communicating with staff on board their support vessel - named the Polar Prince - by messages in the hours prior.

However, contact was lost after an exchange of repeated inquiries from the Polar Prince about the submersible's depth and weight as it descended.

First footage of the vessel's debris has also been released (US Coast Guard)

The mothership then asked repeatedly if the Titan could still see the ship on its onboard display.

One of Titan's final responses, which became 'spotty' as it descended, was simply heard saying 'all good here' during the dive and was never heard from again, according to the visual recreation which was released last week (16 September).

Other findings in the Titan submersible inquiry

The conclusion that the ship had endured an implosion was reached after cameras scanning the ocean floor in the area the vessel lost contact discovered debris - including some traces of human remains - confirming that all five passengers had been killed.

A video has been released of the wreck. (US Coast Guard)

And further evidence of the disaster has emerged this week as part of the South Caroline investigation, including footage of the obliterated vessel which was recorded by a remotely operated vehicle and released by Coast Guard.

In the clip in question, the sub could be seen on the ocean floor with the tail cone sticking out of the sand at the bottom.

As the camera pans, another hefty panel from the wreckage could also be seen, having become detached amid the implosion.