This video from Australia is called GoPro HD: Scuba diving, Great Barrier Reef.
From the Sunday Express in Britain:
Sir David Attenborough, 89, plunges 1000ft below sea level for new documentary
HE MAY be turning 90-years-old next year, but age is nothing but a number to Sir David Attenborough.
By Kirsty McCormack
PUBLISHED: 10:49, Sun, Nov 22, 2015 | UPDATED: 11:03, Sun, Nov 22, 2015
The much-loved broadcaster and naturalist has set a new deep-sea diving record after plunging 1,000ft below sea level for a new documentary.
The father-of-two was armed with a cameraman and Triton submersible pilot as he filmed one of three documentaries, which are set to be shown on BBC One over Christmas.
Speaking of his latest experience, Attenborough told The Sunday Times: “There is no other one like [Triton], and it took me to a part of the reef which no human being has ever looked at before.”
After coming face-to-face with a 6ft grouper fish – which is not known to exist at such depths – Attenborough said he felt “fantastically privileged”.
“David was, as it were, conversing with the fish, which itself must have been surprised to see a sub for the first time,” said Attenborough‘s producer, Anthony Geffen.
“If he did have any worries or fears about going down to 300 metres, he did not show them. Anyway, curiosity always gets the better of him,” he added.
Attenborough made his first trip to the reef back in 1957 for a Zoo Quest programme. The footage was shot in black-and-white and Attenborough described it as “the most exciting natural history experience of my life”.