In April 2005 an international team of rock climbers (four Brits, one Russian and two Venezuelans) made the first free ascent of Angel Falls, the World's highest waterfall. Reaching the base of the wall was an adventure in itself, involving a tiny aeroplane, landing on wild sabana, and a multi-day dugout boat journey up the river Churun with local indigenous Indians.

With over half the pitches weighing in at E6 or above, the team took 19 gruelling days to climb the continuously overhanging 1,000m cliff, spending 14 consecutive nights sleeping on the wall.

Ben Heason will give an illustrated account of the trip, in addition to a slideshow of his other climbing around the world, in the Robert's Engineering Building, Torrington Place, London, WC1E 7JE on Thursday February 16th. The event starts at 19.30.

Tickets are £5, reduced to £2.50 for associates of the University of London (students and staff).