James Cameron has just completed a dive to the deepest point in the entire ocean: the Mariana Trench. It's only the second time ever that it's been reached by a manned vehicle, and the first visit was more than 50 years ago.
His submersible, the 'Deepsea Challenger', took more than two hours to reach the sea floor, where the pressure is equal to 1,000 atmospheres.
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Once there, Cameron made use of the advanced machine to film three hours of footage for a documentary, as well as collecting valuable scientific data via a group of robotic arms controlled from within.
As with all great media masters, his journey was monitored and announced via Twitter on @DeepSeaMaster and by the man himself, @JimCameron. The 'Terminator' director was keen to emphasise that robots weren't all bad:
"Thx for support of science&exploration. When explorers go to hostile realms-space or sea-we live or die by our machines." (sic)
He also received hearty congratulations from Arnold Schwarzenegger (@Schwarzenegger) who tweeted:
"Congrats to my great friend on the deepest solo dive ever. Always a pioneer."