Two thrill-seekers take a leap of faith from the 421-meter-high Kuala Lumpur Tower seconds before releasing their parachutes on Thursday. Base jumping is an extreme sport where parachutists jump from tall buildings or cliffs instead of from aeroplanes. B.A.S.E stands for Building, Antenna, Span and Earth which are the categories of fixed objects from which such adrenalin junkies leap. Around 120 professional base jumpers from 22 countries around the world took part today in the annual KL Tower International Jump in Kuala Lumpur, Malaysia. The KL tower is the sixth tallest TV tower in the world, the largest being the Canton Tower in Guangzhou, China at 610 meters.