A form of skydiving often involving illegal and risky jumps from buildings, antennae, spans or earth (hence the name B.A.S.E.). Generally, the fall is much shorter than a traditional sky dive, which means the parachute must be thrown much earlier. Because of the increase in danger, traditional skydiving should be mastered first and the first jumps should always be accompanied by a veteran. B.A.S.E. jumping, while risky can be a very fun sport, but safety should be a major concern before attempting any jumping.