Despite the rough waters below, the 24 men and women showed no hesitation as they leaped directly from the city's most significant landmark after being zip-lined from the mainland to the actual diving location.
The final rounds from the platforms will be conducted on Sunday.
Scroll through the gallery above and enjoy all the best pictures from day one in Libanon.
Watch Live from Beirut
This event will be LIVE on July 14 at 5.30 PM local time (2.30 PM GMT) on www.redbullcliffdiving.com, Red Bull TV, Facebook & Youtube.
Red Bull TV is available on connected TVs, gaming consoles, mobile devices and more. Find out more at about.redbull.tv
If you miss the event or simply want to watch all the action again, the replay will be available on demand a few minutes after the event.