Video of what a submarine implosion looks like has been shared online after Titanic five died instantly when the submersible suffered ‘catastrophic implosion’ 1,600ft.

An implosion is like a bomb. The vessel would have been crushed in a matter of milliseconds. It occurs if any part of the submersible’s carbon fibre and titanium hull has suffered a small crack or fault as seen in this video.

On Sunday 18 June, the tourist submarine, a 21ft submersible operated by OceanGate Expeditions went missing after contact with the vessel was lost around an hour and 45 minutes after it submerged.

Search and rescue officials say the men likely died on Sunday – before military planes using sonar buoys detected what they thought could have been SOS ‘banging’ sounds in the water.

‘The implosion would have generated a significant, broadband sound that the sonar buoys would have picked up,’ explained Rear Admiral John Mauger of the US Coast Guard at a press conference today.

‘Our hearts are broken. I am so sorry to have to share this tragic news,’ Garriott announced. He said the club was ‘grateful for all our members and the scientific and exploration community around the world who have mobilized personnel and resources to support the search and rescue’.

Garriott described Harding as a ‘dear friend’ to himself and the club. ‘He holds several world records and has continued to push dragons off maps both in person and through supporting expeditions and worthy causes,’ he wrote.

‘We’re heartbroken for the families, friends and colleagues of those who were lost. Their memories will be a blessing and will continue to inspire us in the name of science and exploration,’ Garriott said.